Selective PARP1 inhibitors and their applications

Abstract

A selective PARP1 inhibitor and its application. Provided are a compound represented by the general formula (I-A), a stereoisomer, a pharmaceutically acceptable salt or a deuterated substance thereof. Also provided are a pharmaceutical composition comprising the compound or its stereoisomer and the application of the compound and the pharmaceutical composition in the preparation of an anti-tumor drug.

Description

Technical Field

[0001] The present invention relates to a selective PARP1 inhibitor or a stereoisomer thereof and the application thereof in medicine. Background Art

[0002] PARPs (poly(ADP-ribose) polymerases) are a class of poly ADP-ribose polymerases that catalyze the poly-ADP-ribosylation of various proteins. This process plays an important role in many cellular processes such as DNA damage repair, transcriptional regulation, chromatin reorganization and remodeling. At present, although multiple PARP1 / 2 inhibitors have been successfully launched on the market, in clinical practice, whether used alone or in combination, there are still common side effects such as blood and gastrointestinal tract, which limits their clinical application. Therefore, the development of safer and more effective PARP inhibitors remains an urgent problem to be solved in clinical practice. A series of studies have shown that compared with PARP1 / 2 inhibitors, highly selective PARP1 inhibitors have better efficacy and lower toxicity, and are expected to reduce the potential risks of PARP drugs currently used in clinical practice, broaden the scope of clinical application, and improve the quality of life of patients. Summary of the invention

[0003] The present invention provides a selective PARP1 inhibitor or its stereoisomer, its pharmaceutical composition, and its use in medicine, wherein the compounds described in the specification have high selectivity and significant inhibitory activity against PARP1, and thus have better efficacy and lower toxicity. In addition, in the study, the applicant also found that these compounds can penetrate the blood-brain barrier. Therefore, the compounds described herein or their stereoisomers, and their pharmaceutical compositions can also be used for the treatment of brain tumors.

[0004] One or more embodiments of the present invention provide a compound of formula (IA), a stereoisomer, a pharmaceutically acceptable salt or a deuterated substance thereof:

[0005]

[0006] in:

[0007] R 1 Selected from C 1-6 Alkyl, C 2-6 Alkenyl, C 2-6 Alkynyl, C 3-8 Cycloalkyl or C 3-8 Heterocycloalkyl, the C 3-8 The heterocycloalkyl group may contain 1 to 4 heteroatoms selected from N, O or S;

[0008] R 0 Selected from H, halogen or C1-6 Alkyl, the C 1-6 The alkyl group is optionally further substituted with one or more substituents selected from halogen;

[0009] X 1 , X 2 , X 3 Each independently selected from N or CR X , and X 1 , X 2 , X 3 At least one selected from N;

[0010] R X Selected from H, halogen, hydroxyl, cyano, C 1-6 Alkyl, C 1-6 Alkoxy or C 3-8 Cycloalkyl;

[0011] L is selected from CH 2 ;

[0012] A is a 4- to 12-membered heterocyclic ring selected from a 4- to 12-membered monocyclic ring, a 5- to 12-membered spirocyclic ring, a 4- to 12-membered cyclic ring or a 4- to 12-membered bridged ring, and the 4- to 12-membered heterocyclic ring may contain 1 to 4 heteroatoms selected from N, O or S;

[0013] Structure fragment Selected from or

[0014] R 2b Can be the same or different;

[0015] R 2c Can be the same or different;

[0016] R 2d Can be the same or different;

[0017] R 2e Can be the same or different;

[0018] R 2f Can be the same or different;

[0019] R 2b , R 2c , R 2f Each independently selected from CN, halogen, OR 2a , C 1-6 Alkyl, 4 to 12 membered heterocyclic ring, the C 1-6 Alkyl, 4 to 12 membered heterocyclic ring are optionally further substituted by one or more selected from halogen, OH, C 1-3The alkyl group is substituted with a substituent, and the 4- to 12-membered heterocyclic ring may contain 1 to 4 heteroatoms selected from N, O or S;

[0020] R 2d , R 2e Each independently selected from CN, halogen, OR 2a , C 1-6 Alkyl, the C 1-6 The alkyl group is optionally further substituted with one or more substituents selected from halogen or OH;

[0021] R 2a Selected from H, C 1-6 Alkyl, (CH 2 ) n C 3-8 Cycloalkyl or (CH 2 ) n C 3-8 Heterocycloalkyl, the C 3-8 The heterocycloalkyl group may contain 1 to 4 heteroatoms selected from N, O or S. 1-6 The alkyl group is optionally further substituted with one or more substituents selected from halogen;

[0022] Z 1 , Z 2 , Z 3 are each independently selected from N or C, and Z 1 , Z 2 , Z 3 At least two of them are selected from N;

[0023] n is selected from 0, 1, 2 or 3;

[0024] b is selected from 1, 2 or 3;

[0025] c is selected from 1, 2 or 3;

[0026] d is selected from 2 or 3;

[0027] e is selected from 1, 2 or 3;

[0028] f is selected from 1 or 2;

[0029] The conditions are:

[0030] The compound represented by general formula (IA) is not: or

[0031] In a preferred embodiment, the structural unit Selected from or

[0032] R1 Selected from C 1-6 Alkyl, C 2-6 Alkenyl or C 3-8 Cycloalkyl;

[0033] R 0 is selected from halogen;

[0034] A is selected from or

[0035] R 2b may be the same or different, and are independently selected from CN, halogen, C 1-3 Alkoxy, C 1-3 Alkyl, 4 to 12 membered heterocyclic ring, the C 1-3 Alkyl, C 1-3 Alkoxy, 4 to 12 membered heterocyclic ring are optionally further substituted by one or more selected from halogen, OH, C 1-3 Substitution of alkyl groups;

[0036] R 2c is CN;

[0037] R 2d is CN or halogen;

[0038] R 2f is CN;

[0039] R 2e may be the same or different, and are independently selected from CN, halogen, OR 2a , C 1-6 Alkyl, the C 1-6 The alkyl group is optionally further substituted by one or more substituents selected from halogen and OH;

[0040] R 2a Selected from C 1-3 alkyl, The C 1-3 The alkyl group is optionally further substituted with one or more substituents selected from halogen;

[0041] p is selected from 0 or 1;

[0042] q is selected from 1 or 2.

[0043] In a further preferred embodiment, the structural unit Selected from

[0044] R 1 Selected from C 1-6 Alkyl or C 3-8 Cycloalkyl;

[0045] A is selected from

[0046] R 2e may be the same or different, and are independently selected from CN, OR 2a , C 1-3 Alkyl, the C 1-6 The alkyl group is optionally further substituted by one or more halogens;

[0047] R 2a Selected from C 1-3 alkyl, The C 1-3 The alkyl group is optionally further substituted with one or more substituents selected from halogen.

[0048] In a further preferred embodiment, R 2b Selected from CN, halogen, C 1-3 Alkyl, 5-membered heterocyclic ring, the C 1-3 Alkyl, 5-membered heterocyclic ring may be further substituted by one or more halogen, C 1-3 Substitution of alkyl groups;

[0049] R 2e Selected from CN.

[0050] In a further preferred embodiment, R 2b Selected from CN.

[0051] One or more embodiments of the present invention provide a compound of formula (I), or a stereoisomer thereof:

[0052]

[0053] in:

[0054] R 1 Selected from C 1-6 Alkyl, C 2-6 Alkenyl, C 2-6 Alkynyl, C 3-8 Cycloalkyl or C 3-8 Heterocycloalkyl, the C 3-8 The heterocycloalkyl group may contain 1 to 4 heteroatoms selected from N, O or S;

[0055] X 1 , X 2 , X 3 Each independently selected from N or CR X ;

[0056] R X Selected from H, halogen, hydroxyl, cyano, C 1-6 Alkyl, C 1-6 Alkoxy or C 3-8Cycloalkyl;

[0057] L is selected from CH 2 ;

[0058] A is a 4- to 12-membered heterocyclic ring selected from a 4- to 12-membered monocyclic ring, a 5- to 12-membered spirocyclic ring, a 4- to 12-membered cyclic ring or a 4- to 12-membered bridged ring, and the 4- to 12-membered heterocyclic ring may contain 1 to 4 heteroatoms selected from N, O or S;

[0059] R 2 may be the same or different, and are independently selected from CN, halogen, OR 2a or C 1-6 alkyl;

[0060] R 2a Selected from H, C 1-6 Alkyl, (CH 2 ) n C 3-8 Cycloalkyl or (CH 2 ) n C 3-8 Heterocycloalkyl, the C 3-8 The heterocycloalkyl group may contain 1 to 4 heteroatoms selected from N, O or S. 1-6 The alkyl group is optionally further substituted with one or more substituents selected from halogen;

[0061] Z may be the same or different and are independently selected from CH or N;

[0062] m is selected from 1, 2 or 3;

[0063] n is selected from 0, 1, 2 or 3;

[0064] The conditions are:

[0065] The compound represented by general formula (I) is not

[0066] One or more embodiments of the present invention provide a compound of formula (I), or a stereoisomer thereof:

[0067]

[0068] in:

[0069] R 1 Selected from C 1-6 Alkyl, C 2-6 Alkenyl, C 2-6 Alkynyl, C 3-8 Cycloalkyl or C 3-8 Heterocycloalkyl, the C 3-8 The heterocycloalkyl group may contain 1 to 4 heteroatoms selected from N, O or S;

[0070] X 1 , X 2 , X 3 Each independently selected from N or CR X ;

[0071] R X Selected from H, halogen, hydroxyl, cyano, C 1-6 Alkyl, C 1-6 Alkoxy or C 3-8 Cycloalkyl;

[0072] L is selected from CH 2 ;

[0073] A is a 4- to 12-membered heterocyclic ring selected from a 4- to 12-membered monocyclic ring, a 5- to 12-membered spirocyclic ring, a 4- to 12-membered cyclic ring or a 4- to 12-membered bridged ring, and the 4- to 12-membered heterocyclic ring may contain 1 to 4 heteroatoms selected from N, O or S;

[0074] R 2 may be the same or different, and are independently selected from CN, halogen, OR 2a or C 1-6 Alkyl, the C 1-6 The alkyl group is optionally further substituted by one or more substituents selected from halogen or hydroxy;

[0075] R 2a Selected from H, C 1-6 Alkyl, (CH 2 ) n C 3-8 Cycloalkyl or (CH 2 ) n C 3-8 Heterocycloalkyl, the C 3-8 The heterocycloalkyl group may contain 1 to 4 heteroatoms selected from N, O or S. 1-6 The alkyl group is optionally further substituted with one or more substituents selected from halogen;

[0076] Z may be the same or different and are independently selected from CH or N;

[0077] m is selected from 1, 2 or 3;

[0078] n is selected from 0, 1, 2 or 3;

[0079] The conditions are:

[0080] The compound represented by general formula (I) is not

[0081] One or more embodiments of the present invention provide a compound represented by general formula (II) or a stereoisomer thereof:

[0082]

[0083] in:

[0084] R 1 Selected from C 1-6 Alkyl, C 2-6 Alkenyl, C 2-6 Alkynyl, C 3-8 Cycloalkyl or C 3-8 Heterocycloalkyl, the C 3-8 The heterocycloalkyl group may contain 1 to 4 heteroatoms selected from N, O or S;

[0085] R 0 Selected from H, halogen or C 1-6 Alkyl, the C 1-6 The alkyl group is optionally further substituted with one or more halogen or C 1-6 Substitution of alkyl groups;

[0086] X 1 , X 2 Each independently selected from N or CR X ;

[0087] R X Selected from H, halogen, hydroxyl, cyano, C 1-6 Alkyl, C 1-6 Alkoxy or C 3-8 Cycloalkyl;

[0088] L is selected from CH 2 ;

[0089] A is a 4- to 12-membered heterocyclic ring selected from a 4- to 12-membered monocyclic ring, a 5- to 12-membered spirocyclic ring, a 4- to 12-membered cyclic ring or a 4- to 12-membered bridged ring, and the 4- to 12-membered heterocyclic ring may contain 1 to 4 heteroatoms selected from N, O or S;

[0090] B is selected from a 6-membered aryl or heteroaryl group, wherein the heteroaryl group may contain 1 to 4 heteroatoms selected from N;

[0091] R 2 may be the same or different, and are independently selected from CN, halogen, OR 2a or C 1-6 alkyl;

[0092] R 2a Selected from H, C 1-6 Alkyl, (CH 2 ) n C 3-8Cycloalkyl or (CH 2 ) n C 3-8 Heterocycloalkyl, the C 3-8 The heterocycloalkyl group may contain 1 to 4 heteroatoms selected from N, O or S. 1-6 The alkyl group is optionally further substituted with one or more substituents selected from halogen;

[0093] Z may be the same or different and are independently selected from CH or N;

[0094] m is selected from 1, 2 or 3;

[0095] n is selected from 0, 1, 2 or 3.

[0096] In one or more embodiments of the present invention, the compound of the present invention is selected from:

[0097]

[0098]

[0099]

[0100] One or more embodiments of the present invention provide a pharmaceutical composition, comprising:

[0101] (1) a compound of the present invention or a stereoisomer thereof;

[0102] (2) optionally one or more other active ingredients; and

[0103] (3) Pharmaceutically acceptable carriers and / or excipients.

[0104] One or more embodiments of the present invention provide use of the compound of the present invention or its stereoisomer or the pharmaceutical composition of the present invention in the preparation of a medicament for treating cancer.

[0105] In another aspect, one or more embodiments of the present invention relate to a compound of the present invention or a stereoisomer thereof or a pharmaceutical composition of the present invention for use in treating cancer.

[0106] In another aspect, one or more embodiments of the present invention relate to a method of treating cancer comprising administering a therapeutically effective amount of a compound of the present invention or a stereoisomer thereof or a pharmaceutical composition of the present invention.

[0107] Unless stated to the contrary, the terms used in the specification and claims have the following meanings.

[0108] The carbon, hydrogen, oxygen, sulfur, nitrogen or F, Cl, Br, I involved in the groups and compounds of the present invention include their isotopes, and the carbon, hydrogen, oxygen, sulfur or nitrogen involved in the groups and compounds of the present invention are optionally further replaced by one or more of their corresponding isotopes, wherein the carbon isotopes include 12 C. 13 C and 14 C, hydrogen isotopes include protium (H), deuterium (D, also called heavy hydrogen), tritium (T, also called super tritium), oxygen isotopes include 16 O. 17 O and 18 O, sulfur isotopes include 32 S. 33 S. 34 S and 36 S, isotopes of nitrogen include 14 N and 15 N, fluorine isotopes include 17 F and 19 F, isotopes of chlorine include 35 Cl and 37 Isotopes of Cl and bromine include 79 Br and 81 Br.

[0109] "Alkyl" refers to a straight or branched saturated aliphatic hydrocarbon group of 1 to 20 carbon atoms, preferably an alkyl group of 1 to 8 carbon atoms, more preferably an alkyl group of 1 to 6 carbon atoms, and further preferably an alkyl group of 1 to 4 carbon atoms. Non-limiting examples include methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, neobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, n-hexyl and various branched isomers thereof; when the alkyl group is substituted, it may be optionally further substituted by one or more substituents.

[0110] "Cycloalkyl" refers to a saturated cyclic hydrocarbon group, the ring of which can be a 3-10-membered monocyclic ring, a 4-12-membered bicyclic ring or a 10-20-membered polycyclic ring system, and the ring carbon atoms are preferably 3 to 10 carbon atoms, and further preferably 3 to 8 carbon atoms. "Cycloalkyl" non-limiting examples include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclopropenyl, cyclobutenyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, 1,5-cyclooctadienyl, 1,4-cyclohexadienyl and cycloheptatrienyl, etc. When substituted, it can be optionally further substituted by 0 or more substituents.

[0111] "Heterocycloalkyl" refers to a substituted or unsubstituted saturated non-aromatic ring group, which can be a 3-8-membered monocyclic ring, a 4-12-membered bicyclic ring or a 10-15-membered tricyclic ring system, and contains 1 to 3 heteroatoms selected from N, O or S, preferably a 3-8-membered heterocyclic ring. The N and S optionally substituted in the ring of "heterocycloalkyl" can be oxidized to various oxidation states; "heterocycloalkyl" can be connected to a heteroatom or a carbon atom; "heterocycloalkyl" can be a bridged ring or a spiro ring. Non-limiting examples of “heterocycloalkyl” include oxirane, aziridine, oxetanyl, azetidinyl, 1,3-dioxolanyl, 1,4-dioxolanyl, 1,3-dioxanyl, azepanyl, piperidinyl, piperidinyl, morpholinyl, thiomorpholinyl, 1,3-dithianyl, tetrahydrofuranyl, tetrahydropyrrolyl, tetrahydroimidazolyl, tetrahydrothiazolyl, tetrahydropyranyl, azabicyclo[3.2.1]octanyl, azabicyclo[5.2.0]nonanyl, oxatricyclo[5.3.1.1]dodecyl, azaadamantyl, and oxaspiro[3.3]heptanyl.

[0112] "Alkenyl" refers to a straight or branched unsaturated aliphatic hydrocarbon group consisting of 2 to 20 carbon atoms and containing 1 to 10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10) carbon-carbon double bonds, preferably an alkenyl group of 2 to 12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) carbon atoms, more preferably an alkenyl group of 2 to 8 carbon atoms, and further preferably an alkenyl group of 2 to 6 carbon atoms. Non-limiting examples include vinyl, propene-2-yl, butene-2-yl, butene-2-yl, pentene-2-yl, pentene-4-yl, hexene-2-yl, hexene-3-yl, heptene-2-yl, heptene-3-yl, heptene-4-yl, octen-3-yl, nonen-3-yl, decen-4-yl, and undecen-3-yl. The alkenyl group may be optionally further substituted by one or more substituents.

[0113] "Alkynyl" refers to a straight or branched unsaturated aliphatic hydrocarbon group containing 1 to 3 carbon-carbon triple bonds and consisting of 2 to 20 carbon atoms, preferably an alkynyl group of 2 to 12 carbon atoms, more preferably an alkynyl group of 2 to 8 carbon atoms, and further preferably an alkynyl group of 2 to 6 carbon atoms. Non-limiting examples include ethynyl, propyn-1-yl, propyn-2-yl, butyn-1-yl, butyn-2-yl, butyn-3-yl, 3,3-dimethylbutyn-2-yl, pentyn-1-yl, pentyn-2-yl, hexyn-1-yl, 1-heptyn-1-yl, heptyn-3-yl, heptyn-4-yl, octyn-3-yl, nonyn-3-yl, decyn-4-yl, undecyn-3-yl, dodecyn-4-yl. The alkynyl group may be optionally further substituted with 0 to 4 substituents selected from F, Cl, Br, I, alkyl, alkoxy, straight chain alkenyl, straight chain alkynyl, amino, nitro, cyano, thiol, amide, carbocyclic group or heterocyclic group.

[0114] "Heterocycle" or "heterocyclyl" refers to a saturated or unsaturated aromatic heterocycle or non-aromatic heterocycle. When it is an aromatic heterocycle, its definition is the same as the above "heteroaryl"; when it is a non-aromatic heterocycle, it can be a 3-10 membered (e.g., 3, 4, 5, 6, 7, 8, 9, 10 membered) monocyclic ring, a 4-12 membered (e.g., 4, 5, 6, 7, 8, 9, 10, 11, 12 membered) bicyclic ring or a 10-15 membered (e.g., 10, 11, 12, 13, 14, 15 membered) tricyclic ring system, and contains 1 to 4 (e.g., 1, 2, 3, 4) heteroatoms selected from N, O or S, and is preferably a 3-8 membered heterocyclyl. The 1 to 4 (e.g., 1, 2, 3, 4) N, S optionally substituted in the ring of "heterocyclic group" or "heterocycle" can be oxidized to various oxidation states; "heterocyclic group" or "heterocycle" can be connected to a heteroatom or a carbon atom; "heterocyclic group" or "heterocycle" can be a cyclic, bridged or spirocyclic ring. The "heterocyclic group" or "heterocycle" can be optionally further substituted by one or more substituents.

[0115] "Aryl" refers to a substituted or unsubstituted aromatic ring, which can be a 5-8-membered (e.g., 5, 6, 7, 8-membered) monocyclic ring, a 5-12-membered (e.g., 5, 6, 7, 8, 9, 10, 11, 12-membered) bicyclic ring, or a 10-15-membered (e.g., 10, 11, 12, 13, 14, 15-membered) tricyclic ring system, which can be a bridged ring or a spirocyclic ring, non-limiting examples include phenyl and naphthyl. The aryl group can be optionally further substituted by one or more substituents.

[0116] "Heteroaryl" refers to a substituted or unsubstituted aromatic ring, which can be a monocyclic ring of 3 to 8 members (e.g., 3, 4, 5, 6, 7, 8 members), and contains 1 to 6 (e.g., 1, 2, 3, 4, 5, 6) heteroatoms selected from N, O or S, preferably 5 to 8 heteroaryl. The heteroaryl can be attached to a heteroatom or a carbon atom, and the heteroaryl can be a bridged ring or a spirocyclic ring, and non-limiting examples include cyclopyridyl, furanyl, thienyl, pyranyl, pyrrolyl, pyrimidinyl, pyrazinyl, pyridazinyl, imidazolyl. The heteroaryl is optionally further substituted by one or more substituents.

[0117] When the above-mentioned "alkyl", "alkenyl", "alkynyl", "heterocycle", "heterocyclyl", "cycloalkyl", "heterocycloalkyl", "aryl" or "heteroaryl" is substituted, it may be further substituted with 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 groups selected from F, Cl, Br, I, hydroxyl, mercapto, nitro, cyano, amino, C 1-6 Alkylamino, =O, C 1-6 Alkyl, C 1-6 Alkoxy, C 2-6 Alkenyl, C 2-6Alkynyl, -NR q4 R q5 , =NR q6 、-C(=O)OC 1-6 Alkyl, -OC(=O)C 1-6 Alkyl, -C(=O)NR q4 R q5 , C 3-8 Cycloalkyl, C 3-8 Heterocycloalkyl, C 6-10 Aryl, C 5-10 Heteroaryl, -C(=O)OC 6-10 Aryl, -OC(=O)C 6-10 Aryl, -OC(=O)C 5-10 Heteroaryl, -C(=O)OC 5-10 Heteroaryl, -OC(=O)C 3-8 Heterocycloalkyl, -C(=O)OC 3-8 Heterocycloalkyl, -OC(=O)C 3-8 Cycloalkyl, -C(=O)OC 3-8 Cycloalkyl, -NHC(=O)C 3-8 Heterocycloalkyl, -NHC(=O)C 6-10 Aryl, -NHC(=O)C 5-10 Heteroaryl, -NHC(=O)C 3-8 Cycloalkyl, -NHC(=O)C 3-8 Heterocycloalkyl, -NHC(=O)C 2-6 Alkenyl or -NHC(=O)C 2-6 substituted by a substituent of an alkynyl group, and wherein the substituent C 1-6 Alkyl, C 1-6 Alkoxy, C 2-6 Alkenyl, C 2-6 Alkynyl, C 3-8 Cycloalkyl, C 3-8 Heterocycloalkyl, C 6-10 Aryl, C 5-10 Heteroaryl, -NHC(=O)C 6-10 Aryl, -NHC(=O)C 5-10 Heteroaryl, -NHC(=O)C 3-8 Heterocycloalkyl or -NHC(=O)C 3-8 The cycloalkyl group is optionally further substituted by 1 to 3 groups selected from OH, F, Cl, Br, I, C 1-6 Alkyl, C 1-6 Alkoxy, -NR q4 R q5 Or substituted by a substituent of =O; R q1 Selected from C 1-6 Alkyl, C 1-6Alkoxy or C 6-10 Aryl; R q2 , R q3 Select from H or C 1-6 Alkyl; R q4 , R q5 Selected from H, C 1-6 Alkyl, -NH(C=NR q1 )NR q2 R q3 、-S(=O) 2 NR q2 R q3 、-C(=O)R q1 or -C(=O)NR q2 R q3 , where the C 1-6 The alkyl group is optionally further substituted with one or more groups selected from OH, F, Cl, Br, I, C 1-6 Alkyl, C 1-6 Alkoxy, C 6-10 Aryl, C 5-10 Heteroaryl, C 3-8 Cycloalkyl or C 3-8 is substituted by a substituent of a heterocycloalkyl group; or R q4 With R q5 and N atom form a 3- to 8-membered heterocyclic ring, wherein the ring may contain one or more heteroatoms selected from N, O or S.

[0118] "Pharmaceutical composition" refers to a mixture of one or more compounds described herein, their pharmaceutically acceptable salts or prodrugs and other chemical components, wherein "other chemical components" refers to pharmaceutically acceptable carriers, excipients and / or one or more other therapeutic agents.

[0119] "Carrier" refers to a material that does not cause significant irritation to an organism and does not abrogate the biological activity and properties of the administered compound.

[0120] "Excipient" refers to an inert substance added to a pharmaceutical composition to facilitate administration of a compound. Non-limiting examples include calcium carbonate, calcium phosphate, sugars, starches, cellulose derivatives (including microcrystalline cellulose), gelatin, vegetable oils, polyethylene glycols, diluents, granulating agents, lubricants, binders, and disintegrants.

[0121] "Stereoisomers" refer to isomers resulting from different spatial arrangements of atoms in a molecule, including cis-trans isomers, enantiomers and conformational isomers.

[0122] "Optional" or "optionally" or "selective" or "selectively" means that the subsequently described event or circumstance may but need not occur, and the description includes instances where the event or circumstance occurs and instances where it does not occur. For example, "heterocyclyl optionally substituted with alkyl" means that the alkyl group may but need not be present, and the description includes instances where the heterocyclyl group is substituted with alkyl group and instances where the heterocyclyl group is not substituted with alkyl group. DETAILED DESCRIPTION

[0123] The following embodiments illustrate the technical solutions of the present invention in detail, but the protection scope of the present invention includes but is not limited to them.

[0124] The structures of the compounds were determined by nuclear magnetic resonance (NMR) or / and mass spectrometry (MS). NMR shifts (δ) were measured in 10 -6 The NMR measurements were performed using Bruker Avance III 400 and Bruker Avance 300 NMR spectrometers, and the solvent used was deuterated dimethyl sulfoxide (DMSO-d 6 ), deuterated chloroform (CDCl 3 ), deuterated methanol (CD 3 OD), the internal standard was tetramethylsilane (TMS);

[0125] MS was determined using Agilent 6120B (ESI) and Agilent 6120B (APCI);

[0126] The thin layer chromatography silica gel plate uses Yantai Huanghai HSGF254 or Qingdao GF254 silica gel plate. The silica gel plate used in thin layer chromatography (TLC) uses a specification of 0.15mm-0.20mm, and the specification used for thin layer chromatography separation and purification products is 0.4mm-0.5mm;

[0127] Column chromatography generally uses Yantai Huanghai Silica Gel 200-300 mesh silica gel as the carrier.

[0128] Example 1

[0129] 4-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)-3-fluorobenzonitrile (Compound 1)

[0130] 4-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)-3-fluorobenzonitrile

[0131]

[0132] first step

[0133] tert-Butyl 4-(4-cyano-2-fluorophenyl)piperazine-1-carboxylate (1c)

[0134] tert-butyl 4-(4-cyano-2-fluorophenyl)piperazine-1-carboxylate

[0135] 4-Bromo-3-fluorobenzonitrile compound 1a (1 g, 5.00 mmol) and tert-butylpiperazine-1-carboxylate compound 1b (838 mg, 4.5 mmol) were dissolved in toluene (15 mL), and palladium acetate (112 mg, 0.5 mmol) and 1,1′-binaphthyl-2,2′-bisdiphenylphosphine (311 mg, 0.5 mmol) were added. The reaction flask was replaced with nitrogen and placed in an oil bath at 120°C for reaction. After 16 h of reaction, water (20 mL) was added to quench the reaction, and ethyl acetate (3×30 mL) was added for extraction. The organic phases were combined and concentrated under reduced pressure. The crude product was purified by column chromatography (PE: EA = 5: 1) to obtain compound 1c (yellow solid, 1.4 g, yield 92%).

[0136] LCMS m / s=306.15[M+1].

[0137] Step 2:

[0138] 3-Fluoro-4-(piperazin-1-yl)benzonitrile (1d)

[0139] 3-fluoro-4-(piperazin-1-yl)benzonitrile

[0140] A solution of hydrochloric acid in 1,4-dioxane (4 M, 15 mL) was added to compound 1c (1.4 g, 4.60 mmol), and the reaction was stirred at room temperature for 16 h. The reaction solution was filtered and the filter cake was collected to obtain compound 1d (yellow solid, 880 mg, yield 94%).

[0141] 1 H NMR (400 MHz, DMSO-d 6 )δ9.58 (s, 1H), 7.69 (dd, J=13.4, 2.0Hz, 1H), 7.63-7.54 (m, 2H), 3.53-3.51 (m, 4H), 3.15-3.12 (m, 4H).

[0142] LCMS m / s=205.10[M+1].

[0143] Step 3:

[0144] 4-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)-3-fluorobenzonitrile (Compound 1)

[0145] 4-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)-3-fluorobenzonitrile

[0146] Compound 1e was prepared according to the synthesis method of intermediate 14 in patent WO2021013735 (white solid 5 g, yield 76%), LCMS m / s = 267 [M+1].

[0147] Compound 1d (100 mg, 0.49 mmol) and compound 1e (130 mg, 0.49 mmol) were dissolved in acetonitrile (5 mL), and N,N-diisopropylethylamine (316 mg, 2.45 mmol) was added. The reaction system was replaced with nitrogen and placed in a 70°C oil bath for 3 h. The reaction solution was concentrated under reduced pressure to obtain a crude product, which was then purified by column chromatography (MeOH:DCM=1:60 to 1:5) to obtain compound 1 (white solid, 139 mg, yield: 73%).

[0148] 1 H NMR (400 MHz, DMSO-d 6 )δ11.86 (s, 1H), 8.40 (d, J=1.8Hz, 1H), 7.77-7.67 (m, 2H), 7.63-7.54 (m, 2H), 7.12 (t, J =8.7Hz, 1H), 3.64(s, 2H), 3.21-3.17(m, 4H), 2.57-2.53(m, 6H), 1.18(t, J=7.4Hz, 3H).

[0149] LCMS m / s=392.2[M+1].

[0150] Example 2

[0151] 7-((4-(3,5-difluoropyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 2)

[0152] 7-((4-(3,5-difluoropyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0153]

[0154] first step

[0155] 4-(3,5-Difluoropyridin-2-yl)piperazine-1-carboxylic acid tert-butyl ester (2c)

[0156] tert-butyl 4-(3,5-difluoropyridin-2-yl)piperazine-1-carboxylate

[0157] According to the method of intermediate 1c, intermediate 2c (yellow solid, 1.8 g, yield 85%) was prepared.

[0158] 1 H NMR (400MHz, DMSO-d6) δ8.11 (d, 1H), 7.82 (ddd, 1H), 3.45-3.43 (m, 4H), 3.26-3.23 (m, 4H), 1.41 (s, 9H).

[0159] LCMS m / s=300.10[M+1].

[0160] Step 2

[0161] 1-(3,5-Difluoropyridin-2-yl)piperazine (2d)

[0162] 1-(3,5-difluoropyridin-2-yl)piperazine

[0163] According to the method of intermediate 1d, intermediate 2d (yellow solid, 1.1 g, yield 92%) was prepared.

[0164] 1 H NMR (400MHz, DMSO-d6) δ9.46 (dr, 1H), 8.15 (d, 1H), 7.88 (ddd, 1H), 3.55-3.52 (m, 4H), 3.20-3.16 (m, 4H).

[0165] LCMS m / s=200.10[M+1].

[0166] Step 3

[0167] 7-((4-(3,5-difluoropyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 2)

[0168] 7-((4-(3,5-difluoropyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0169] According to the method of compound 1, compound 2 (white solid, 40 mg, yield 40%) was prepared.

[0170] 1 H NMR (600MHz, DMSO-d6) δ11.84 (s, 1H), 8.40 (d, 1H), 8.09 (d, 1H), 7.78 (ddd, 1H), 7.75 (s, 1H), 7.62 (d, 1H), 3.64 (s, 2H), 3.32-3.30 (m, 4H), 2.57-2.52 (m, 6H), 1.18 (t, 3H).

[0171] LCMS m / s=386.20[M+1].

[0172] Example 3

[0173] 3-ethyl-7-((4-(5-fluoropyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 3)

[0174] 3-ethyl-7-((4-(5-fluoropyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one

[0175]

[0176] first step

[0177] 4-(5-Fluoropyridin-2-yl)piperazine-1-carboxylic acid tert-butyl ester (3c)

[0178] tert-butyl 4-(5-fluoropyridin-2-yl)piperazine-1-carboxylate

[0179] According to the method of intermediate 1c, intermediate 3c (yellow solid, 2 g, yield 90%) was prepared.

[0180] 1 H NMR (400MHz, DMSO-d6) δ8.10 (d, 1H), 7.53 (ddd, 1H), 6.89 (dd, 1H), 3.41 (s, 8H), 1.41 (s, 9H).

[0181] LCMS m / s=282.20[M+1].

[0182] Step 2

[0183] 1-(5-Fluoropyridin-2-yl)piperazine (3d)

[0184] 1-(5-fluoropyridin-2-yl)piperazine

[0185] According to the method of intermediate 1d, intermediate 3d (yellow solid, 1.2 g, yield 92%) was prepared.

[0186] 1 H NMR (400MHz, DMSO-d6) δ9.55 (dr, 1H), 8.15 (d, 1H), 7.64 (td, 1H), 7.02 (dd, 1H), 3.72-3.69 (m, 4H), 3.21-3.01 (m, 4H).

[0187] LCMS m / s=182.20[M+1].

[0188] Step 3

[0189] 3-ethyl-7-((4-(5-fluoropyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 3)

[0190] 3-ethyl-7-((4-(5-fluoropyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one

[0191] According to the method of compound 1, compound 3 (white solid, 50 mg, yield 45%) was prepared.

[0192] 1 H NMR (400MHz, DMSO-d6) δ11.86 (s, 1H), 8.39 (d, 1H), 8.08 (d, 1H), 7.74 (s, 1H), 7.62 (d, 1H), 7.49 (dd d, 1H), 6.86 (dd, 1H), 3.62 (s, 2H), 3.48-3.38 (m, 4H), 2.53 (q, 2H), 2.50-2.46 (m, 4H), 1.17 (t, 3H).

[0193] LCMS m / s=368.20[M+1].

[0194] Example 4

[0195] 5-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)picolinonitrile (Compound 4)

[0196] 5-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)picolinonitrile

[0197]

[0198] first step

[0199] tert-Butyl 4-(6-cyanopyridin-3-yl)piperazine-1-carboxylate (4c)

[0200] tert-butyl 4-(6-cyanopyridin-3-yl)piperazine-1-carboxylate

[0201] According to the method of intermediate 1c, intermediate 4c (yellow solid, 1.3 g, yield 88%) was prepared.

[0202] LCMS m / s=289.16[M+1].

[0203] Step 2

[0204] 5-(Piperazin-1-yl)pyridinecarbonitrile (4d)

[0205] 5-(piperazin-1-yl)picolinonitrile

[0206] According to the method of intermediate 1d, intermediate 4d (yellow solid, 1.0 g, yield 91%) was prepared.

[0207] LCMS m / s=189.10[M+1].

[0208] Step 3

[0209] 5-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)picolinonitrile (Compound 4)

[0210] 5-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)picolinonitrile

[0211] According to the method of compound 1, compound 4 (white solid, 47 mg, yield 51%) was prepared.

[0212] 1 H NMR (400MHz, DMSO-d6) δ11.87 (s, 1H), 8.42 (d, J = 3.0Hz, 1H), 8.40 (d, J = 1.9Hz, 1H), 7.79-7.72 (m, 2H), 7.61 ( s, 1H), 7.36 (dd, J=8.9, 3.0Hz, 1H), 3.64 (s, 2H), 3.43-3.40 (m, 4H), 2.58-2.51 (m, 6H), 1.18 (t, J=7.4Hz, 3H).

[0213] LCMS m / s=375.16[M+1].

[0214] Example 5

[0215] 7-((4-(6-(2,2-difluoroethoxy)pyridin-3-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 5)

[0216] 7-((4-(6-(2,2-difluoroethoxy)pyridin-3-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0217]

[0218]

[0219] first step

[0220] tert-Butyl 4-(6-(2,2-difluoroethoxy)pyridin-3-yl)piperazine-1-carboxylate (5c)

[0221] tert-butyl 4-(6-(2,2-difluoroethoxy)pyridin-3-yl)piperazine-1-carboxylate

[0222] According to the method of intermediate 1c, intermediate 5c (yellow solid, 1.4 g, yield 84%) was prepared.

[0223] 1H NMR (400MHz, DMSO-d6) δ7.80 (d, J=3.0Hz, 1H), 7.51 (dd, J=9.0, 3.0Hz, 1H), 6.83 (d, J=9.0Hz, 1H), 6.35 (tt, J=54.9, 3.6Hz, 1H), 4.47 (td, J=15.0, 3.7Hz, 2H), 3.45 (t, J=5.1Hz, 4H), 3.01 (t, J=5.2Hz, 4H), 1.41 (s, 9H).

[0224] LCMS m / s=344.37[M+1].

[0225] Step 2

[0226] 1-(6-(2,2-difluoroethoxy)pyridin-3-yl)piperazine (5d)

[0227] 1-(6-(2,2-difluoroethoxy)pyridin-3-yl)piperazine

[0228] According to the method of intermediate 1d, intermediate 5d (yellow solid, 1.2 g, yield 93%) was prepared.

[0229] 1 H NMR (400MHz, DMSO-d6) δ9.46 (s, 1H), 7.85 (d, J=3.0Hz, 1H), 7.56 (dd, J=9.0, 3.1Hz, 1H), 7.09 (s, 1H), 6.51-6.22 (m, 1H), 4.53-4.46 (m, 2H), 3.31 (dd, J=6.6, 3.7Hz, 4H), 3.21-3.17 (m, 4H).

[0230] LCMS m / s=244.26[M+1].

[0231] Step 3

[0232] 7-(4-(6-(2,2-difluoroethoxy)pyridin-3-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 5)

[0233] 7-((4-(6-(2,2-difluoroethoxy)pyridin-3-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0234] According to the method of compound 1, compound 5 (white solid, 63 mg, yield 64%) was prepared.

[0235] 1 H NMR (400MHz, DMSO-d6) δ11.86 (s, 1H), 8.39 (d, J=1.8Hz, 1H), 7.77 (d, J=3.0H z, 1H), 7.75 (s, 1H), 7.62 (d, J=1.8Hz, 1H), 7.49 (dd, J=9.0, 3.1Hz, 1H), 6.80 ( d, J=9.0Hz, 1H), 6.35 (tt, J=55.0, 3.7Hz, 1H), 4.46 (td, J=15.0, 3.7Hz, 2H), 3.64 (s, 2H), 3.08 (t, J = 4.7Hz, 4H), 2.58-2.52 (m, 6H), 1.18 (t, J = 7.4Hz, 3H).

[0236] LCMS m / s=430.47M+1].

[0237] Example 6

[0238] 3-ethyl-7-((4-(6-((tetrahydrofuran-3-yl)methoxy)pyridin-3-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 6)

[0239] 3-ethyl-7-((4-(6-((tetrahydrofuran-3-yl)methoxy)pyridin-3-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one

[0240]

[0241] first step

[0242] tert-Butyl 4-(6-((tetrahydrofuran-3-yl)methoxy)pyridin-3-yl)piperazine-1-carboxylate (6c)

[0243] tert-butyl 4-(6-((tetrahydrofuran-3-yl)methoxy)pyridin-3-yl)piperazine-1-carboxylate

[0244] According to the method of intermediate 1c, intermediate 6c (yellow solid, 1.1 g, yield 87%) was prepared.

[0245] 1H NMR (400MHz, DMSO-d6) δ7.78 (d, J=3.0Hz, 1H), 7.46 (dd, J=9.0, 3.0Hz, 1H), 6.73 (d, J=9.0Hz, 1H), 4.68 (dd, J=7.9, 6.0Hz, 2H), 4.12-4.10 (m , 2H), 3.89 (dd, J=6.5, 4.8Hz, 2H), 3.45 (t, J=5.0Hz, 4H), 3.36 (dd, J=7.9, 6.4Hz, 1H), 2.98 (t, J=5.1Hz, 4H), 1.94-1.87 (m, 2H), 1.41 (s, 9H).

[0246] LCMS m / s=364.46[M+1].

[0247] Step 2

[0248] 1-(6-((Tetrahydrofuran-3-yl)methoxy)pyridin-3-yl)piperazine (6d)

[0249] 1-(6-((tetrahydrofuran-3-yl)methoxy)pyridin-3-yl)piperazine

[0250] According to the method of intermediate 1d, intermediate 6d (yellow solid, 904 mg, yield 90%) was prepared.

[0251] 1 H NMR (400MHz, DMSO-d6) δ9.46 (s, 1H), 7.78 (d, J=3.0Hz, 1H), 7.46 (dd, J=9.0, 3.0Hz, 1H), 6.73 (d, J=9.0Hz, 1H), 4.68 (dd, J=7.9, 6.0Hz, 2H), 4.12-4.10 (m, 2H), 3.89 (dd, J=6.5, 4.8Hz, 2H), 3.45 (t, J=5.0Hz, 4H), 3.36 (dd, J=7.9, 6.4Hz, 1H), 2.98 (t, J=5.1Hz, 4H), 1.94-1.87 (m, 2H).

[0252] LCMS m / s=264.34[M+1].

[0253] Step 3

[0254] 3-ethyl-7-((4-(6-((tetrahydrofuran-3-yl)methoxy)pyridin-3-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 6)

[0255] 3-ethyl-7-((4-(6-((tetrahydrofuran-3-yl)methoxy)pyridin-3-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one

[0256] According to the method of compound 1, compound 6 (white solid, 41 mg, yield 59%) was prepared.

[0257] 1 H NMR (400MHz, DMSO-d6) δ11.94(s, 1H), 8.92(s, 1H), 8.67(s, 1H), 7.87(s, 1H), 7.84(s, 1H ), 7.47 (d, J=8.9Hz, 1H), 6.76 (d, J=9.1Hz, 1H), 4.54 (s, 1H), 4.25-4.00 (m, 2H), 3.79-3. 71(m, 2H), 3.67-3.56(m, 6H), 3.44(s, 1H), 3.24(s, 1H), 3.06(s, 2H), 2.67-2.51(m, 4H), 1.99 (ddd, J=15.3, 7.8, 4.1Hz, 1H), 1.61 (dq, J=13.3, 6.8Hz, 1H), 1.19 (t, J=7.4Hz, 3H).

[0258] LCMS m / s=450.56[M+1].

[0259] Example 7

[0260] 3-ethyl-7-((4-(6-(oxetan-3-ylmethoxy)pyridin-3-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 7)

[0261] 3-ethyl-7-((4-(6-(oxetan-3-ylmethoxy)pyridin-3-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one

[0262]

[0263] first step

[0264] tert-Butyl 4-(6-(oxa-3-ylmethoxy)pyridin-3-yl)piperazine-1-carboxylate (7c)

[0265] tert-butyl 4-(6-(oxetan-3-ylmethoxy)pyridin-3-yl)piperazine-1-carboxylate

[0266] According to the method of intermediate 1c, intermediate 7c (yellow solid, 1.9 g, yield 89%) was prepared.

[0267] 1 H NMR (400MHz, DMSO-d6) δ7.78 (d, J=3.0Hz, 1H), 7.46 (dd, J=9.0, 3.0Hz, 1H), 6.73 (d, J=9.0Hz, 1H), 4.68 (dd, J=7.9, 6.0Hz , 2H), 4.39 (dd, J=6.5, 4.8Hz, 4H), 3.45 (t, J=5.0Hz, 4H), 3.36 (dd, J=7.9, 6.4Hz, 1H), 2.98 (t, J=5.1Hz, 4H), 1.41 (s, 9H).

[0268] LCMS m / s=350.43[M+1].

[0269] Step 2

[0270] 1-(6-(Oxa-3-ylmethoxy)pyridin-3-yl)piperazine (7d)

[0271] 1-(6-(oxetan-3-ylmethoxy)pyridin-3-yl)piperazine

[0272] According to the method of intermediate 1d, intermediate 7d (yellow solid, 1.4 g, yield 86%) was prepared.

[0273] LCMS m / s=250.31[M+1].

[0274] Step 3

[0275] 3-ethyl-7-((4-(6-(oxa-3-ylmethoxy)pyridin-3-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 7)

[0276] 3-ethyl-7-((4-(6-(oxetan-3-ylmethoxy)pyridin-3-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one

[0277] According to the method of compound 1, compound 7 (white solid, 37 mg, yield 63%) was prepared.

[0278] 1 H NMR (400MHz, DMSO-d6) δ 11.94 (s, 1H), 8.92 (s, 1H), 8.67 (s, 1H), 7.87 (s, 1H), 7.84 (s, 1H), 7.47 (d, J = 8.9Hz, 1H), 6.76 (d, J = 9.1Hz, 1H), 4. 54 (s, 1H), 4.39 (dd, J=6.5, 4.8Hz, 4H), 3.67-3.56 (m, 6H), 3.44 (s, 1H), 3.24 (s, 1H), 3.06 (s, 2H), 2.67-2.51 (m, 4H), 1.19 (t, J=7.4Hz, 3H).

[0279] LCMS m / s=436.53[M+1].

[0280] Example 8

[0281] 3-ethyl-7-((4-(6-(hydroxymethyl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 8)

[0282] 3-ethyl-7-((4-(6-(hydroxymethyl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one

[0283]

[0284]

[0285] first step

[0286] tert-Butyl 4-(6-(Hydroxymethyl)pyridin-2-yl)piperazine-1-carboxylate (8c)

[0287] tert-butyl 4-(6-(hydroxymethyl)pyridin-2-yl)piperazine-1-carboxylate

[0288] According to the method of intermediate 1c, intermediate 8c (yellow solid, 1.7 g, yield 82%) was prepared.

[0289] 1 H NMR (400 MHz, DMSO-d 6)δ7.74(d, 1H), 7.41(dd, 1H), 6.95(d, 1H), 5.33(t, 1H), 4.68(dd, 2H), 3.45(t, 4H), 2.98(t, 4H), 1.41(s, 9H).

[0290] LCMS m / s=294.17[M+1].

[0291] Step 2

[0292] (6-(Piperazin-1-yl)pyridin-2-yl)methanol (8d)

[0293] (6-(piperazin-1-yl)pyridin-2-yl)methanol

[0294] According to the method of intermediate 1d, intermediate 8d (yellow solid, 1.2 g, yield 87%) was prepared.

[0295] LCMS m / s=194.12[M+1].

[0296] Step 3

[0297] 3-ethyl-7-((4-(6-(hydroxymethyl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 8)

[0298] 3-ethyl-7-((4-(6-(hydroxymethyl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one

[0299] According to the method of compound 1, compound 8 (white solid, 27 mg, yield 55%) was prepared.

[0300] 1 H NMR (400 MHz, DMSO-d 6 )δ11.64(s, 1H), 8.92(s, 1H), 8.67(s, 1H), 7.87(s, 1H), 7.84(s, 1H), 7.47(d, 1H), 7.09(d, 1H) , 5.64(t, 1H), 4.68(dd, 2H), 3.45(t, 4H), 3.06(s, 2H), 2.98(t, 4H), 2.43(dd, 2H), 1.19(t, 3H).

[0301] LCMS m / s=436.53[M+1].

[0302] Example 9

[0303] 3-ethyl-7-((4-(5-(trifluoromethyl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 9)

[0304] 3-ethyl-7-((4-(5-(trifluoromethyl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one

[0305]

[0306] first step

[0307] tert-Butyl 4-(5-(Trifluoromethyl)pyridin-2-yl)piperazine-1-carboxylate (9b)

[0308] tert-butyl 4-(5-(trifluoromethyl)pyridin-2-yl)piperazine-1-carboxylate

[0309] According to the method of intermediate 1c, intermediate 9b (yellow solid, 1.3 g, yield 82%) was prepared.

[0310] LCMS m / s=332.34[M+1].

[0311] Step 2

[0312] 1-(5-(Trifluoromethyl)pyridin-2-yl)piperazine (9c)

[0313] 1-(5-(trifluoromethyl)pyridin-2-yl)piperazine

[0314] According to the method of intermediate 1d, intermediate 9c (yellow solid, 900 mg, yield 89%) was prepared.

[0315] 1 H NMR (400 MHz, DMSO-d 6 )δ9.73 (s, 1H), 8.45 (d, 1H), 7.90 (dd, 1H), 7.08 (d, 1H), 3.91 (t, 4H), 3.14 (p, 4H).

[0316] LCMS m / s=232.22[M+1].

[0317] Step 3

[0318] 3-ethyl-7-((4-(5-(trifluoromethyl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 9)

[0319] 3-ethyl-7-((4-(5-(trifluoromethyl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one

[0320] According to the method of compound 1, compound 9 (white solid, 23 mg, yield 71%) was prepared.

[0321] 1 H NMR (400 MHz, DMSO-d 6 )δ11.87 (s, 1H), 8.40 (d, 2H), 7.79 (dd, 1H), 7.75 (d, 1H), 7.62 (d, 1H), 6.95 (d, 1H), 3.64 (d, 6H), 2.55 (td, 2H), 2.48 (t, 4H), 1.18 (t, 3H).

[0322] LCMS m / s=418.44[M+1].

[0323] Example 10

[0324] 7-((4-(5-chloropyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 10)

[0325] 7-((4-(5-chloropyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0326]

[0327] first step

[0328] tert-Butyl 4-(5-chloropyridin-2-yl)piperazine-1-carboxylate (10b)

[0329] tert-butyl 4-(5-chloropyridin-2-yl)piperazine-1-carboxylate

[0330] According to the method of intermediate 1c, intermediate 10b (yellow solid, 1.2 g, yield 80%) was prepared.

[0331] LCMS m / s=298.78[M+1].

[0332] Step 2

[0333] 1-(5-Chloropyridin-2-yl)piperazine (10c)

[0334] 1-(5-chloropyridin-2-yl)piperazine

[0335] According to the method of intermediate 1d, intermediate 10c (yellow solid, 930 mg, yield 82%) was prepared.

[0336] LCMS m / s=198.67[M+1].

[0337] Step 3

[0338] 7-((4-(5-chloropyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 10)

[0339] 7-((4-(5-chloropyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0340] According to the method of compound 1, compound 10 (white solid, 46 mg, yield 74%) was prepared.

[0341] 1 H NMR (400 MHz, DMSO-d 6 )δ11.87(s, 1H), 8.39(d, 1H), 8.10(d, 1H), 7.75(d, 1H), 7.64-7.54(m, 2H), 6. 86(d, 1H), 3.62(s, 2H), 3.48(t, 4H), 2.55(td, 2H), 2.48(t, 4H), 1.18(t, 3H).

[0342] LCMS m / s=384.88[M+1].

[0343] Embodiment 11

[0344] 4-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)-3-fluorobenzonitrile (Compound 11)

[0345] 4-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)-3-fluorobenzonitrile

[0346]

[0347] first step

[0348] Ethyl 6-formyl-5-nitronicotinate (11b)

[0349] ethyl 6-formyl-5-nitronicotinate

[0350] 6-Methyl-5-nitronicotinic acid ethyl ester 11a (purchased from Jiangsu Aikang Biopharmaceutical Research and Development Co., Ltd., 10 g, 45.6 mmol) and selenium dioxide (7.6 g, 68.4 mmol) were dissolved in dioxane (100 mL) and refluxed at 110° C. for 4 hours. After the reaction, the mixture was hot filtered and the filtrate was concentrated under reduced pressure. Compound 11b (yellow solid, 9.7 g, yield 90%) was obtained by column chromatography.

[0351] LC-MS m / z(ESI)=225.10[M+1].

[0352] Step 2

[0353] 6-(2-Bromo-3-ethoxy-3-oxopropane-1-en-1-yl)-5-nitronicotinic acid ethyl ester (11c)

[0354] ethyl 6-(2-bromo-3-ethoxy-3-oxoprop-1-en-1-yl)-5-nitronicotinate

[0355] Ethyl 2-bromo-2-(diethoxyphosphoryl)acetate (purchased from Shanghai Mairui Chemical Technology Co., Ltd., 20 g, 66.6 mmol) was dissolved in tetrahydrofuran (100 mL), sodium hydride (1.6 g, 66.6 mmol) was slowly added at -78 ° C, the temperature was slowly raised to 40 ° C and reacted for 10 minutes, then the temperature was lowered to -78 ° C and a tetrahydrofuran solution of 11b (9.7 g, 44.4 mmol) was slowly added dropwise, and after reacting for 15 minutes, a saturated aqueous ammonium chloride solution (100 mL) was added to quench, and ethyl acetate (100 mL×3) was used for extraction. The organic phases were combined and concentrated under reduced pressure, and 11c (yellow solid, 13 g, yield 81%, E / Z=10:3) was obtained by column chromatography.

[0356] 1 H NMR (400 MHz, DMSO-d6 )δ9.42(d, 1H), 9.23(d, 0.3H), 8.86(d, 1H), 8.80(d, 0.3H), 8.61(s, 1H), 7.89(s, 0.3H), 4.46- 4.38(m, 2.6H), 4.34(q, 2H), 4.16(q, 0.6H), 1.39-1.34(m, 3.9H), 1.32(t, 3H), 1.08(t, 0.9H).

[0357] LC-MS m / z(ESI)=373.00[M+1].

[0358] Step 3

[0359] 5-Amino-6-(2-bromo-3-ethoxy-3-oxoprop-1-en-1-yl)nicotinate ethyl ester (11d)

[0360] ethyl 5-amino-6-(2-bromo-3-ethoxy-3-oxoprop-1-en-1-yl)nicotinate

[0361] Compound 11c (13 g, 34.8 mmol) was dissolved in acetic acid (130 mL), and iron powder (5.8 g, 104.5 mmol) was added. After reacting at room temperature for 2 hours, distilled water (100 mL) was added to quench the reaction. The mixture was extracted with ethyl acetate (100 mL×3), and the organic phases were combined and concentrated under reduced pressure to give compound 11d (yellow solid, 10 g, yield 83%).

[0362] LC-MS m / z(ESI)=343.00[M+1].

[0363] Step 4

[0364] 7-Bromo-6-oxo-5,6-dihydro-1,5-naphthyridine-3-carboxylic acid ethyl ester (11e)

[0365] ethyl 7-bromo-6-oxo-5, 6-dihydro-1, 5-naphthyridine-3-carboxylate

[0366] Compound 11d (10 g, 29.1 mmol) was placed in a reaction bottle, and a solution of hydrogen bromide in acetic acid (100 mL) was added under nitrogen protection. The mixture was reacted at 50°C for 4 hours and then concentrated under reduced pressure. Saturated aqueous sodium bicarbonate solution (100 mL) was added, and the mixture was extracted with ethyl acetate (50 mL×3). The mixture was concentrated under reduced pressure and column chromatography was used to obtain compound 11e (yellow solid, 2 g, yield 23%).

[0367] 1H NMR (400 MHz, DMSO-d 6 )δ12.54(s, 1H), 8.88(d, 1H), 8.51(s, 1H), 8.14(d, 1H), 4.37(q, 2H), 1.35(t, 3H).

[0368] LC-MS m / z(ESI)=297.00[M+1].

[0369] Step 5

[0370] 7-Cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridine-3-carboxylic acid ethyl ester (11f)

[0371] ethyl 7-cyclopropyl-6-oxo-5, 6-dihydro-1, 5-naphthyridine-3-carboxylate

[0372] Compound 11e (400 mg, 1.3 mmol), [1,1′-bis(diphenylphosphino)ferrocene] dichloropalladium dichloromethane complex (purchased from Chengdu Dingdang Times Pharmaceutical Technology Co., Ltd., 328 mg, 0.40 mmol), potassium carbonate (745 mg, 5.4 mmol), and cyclopropylboronic acid (Hangzhou Aikon Biotechnology Co., Ltd., 231 mg, 2.7 mmol) were dissolved in dioxane (4 mL), refluxed at 110°C for 8 hours, quenched with water (5 mL), extracted with ethyl acetate (5 mL×3), concentrated under reduced pressure, and purified by column chromatography to obtain compound 11f (yellow solid, 270 mg, yield 77%).

[0373] 1 H NMR (400 MHz, DMSO-d 6 )δ12.07 (s, 1H), 8.85 (d, 1H), 8.12 (d, 1H), 7.46 (s, 1H), 4.36 (q, 2H), 2.25-2.12 (m, 1H), 1.34 (t, 3H), 1.02 (dt, 2H), 0.90 (dt, 2H).

[0374] LC-MS m / z(ESI)=259.10[M+1].

[0375] Step 6

[0376] 3-Cyclopropyl-7-(hydroxymethyl)-1,5-naphthyridin-2(1H)-one (11 g)

[0377] 3-cyclopropyl-7-(hydroxymethyl)-1,5-naphthyridin-2(1H)-one

[0378] Compound 11f (270 mg, 1 mmol) was dissolved in tetrahydrofuran (2 mL), and a tetrahydrofuran solution of lithium aluminum hydroxide (purchased from Anaiji Chemical, 2 mL, 2 mmol) was slowly added dropwise under an ice-water bath. After the addition was completed, the mixture was stirred for 10 minutes, ethyl acetate (1 mL) was added, and the mixture was concentrated under reduced pressure. Compound 11g (yellow solid, 100 mg, yield 44%) was obtained by column chromatography.

[0379] 1 H NMR (400 MHz, DMSO-d 6 )δ11.92 (s, 1H), 8.35 (d, 1H), 7.59 (d, 1H), 7.41 (s, 1H), 5.45 (t, 1H), 4.60 (d, 2H), 2.16-2.09 (m, 1H), 0.96 (dt, 2H), 0.82 (dt, 2H).

[0380] LC-MS m / z(ESI)=217.10[M+1].

[0381] Step 7

[0382] 7-(Bromomethyl)-3-cyclopropyl-1,5-naphthyridin-2(1H)-one (11h)

[0383] 7-(bromomethyl)-3-cyclopropyl-1,5-naphthyridin-2(1H)-one

[0384] Compound 11g (100 mg, 0.46 mmol) and triphenylphosphine (purchased from Shanghai Adamas Reagent Co., Ltd., 242 mg, 0.92 mmol) were dissolved in dichloromethane (1 mL), and a solution of carbon tetrabromide (purchased from Anage Chemical, 306 mg, 0.92 mmol) in dichloromethane (0.5 mL) was added under an ice-water bath. The reaction was allowed to react for 0.5 hours. The reaction solution was concentrated under reduced pressure and purified by column chromatography to obtain compound 11h (yellow solid, 100 mg, yield 78%).

[0385] LC-MS m / z(ESI)=279.00[M+1].

[0386] Step 8

[0387] 5-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)-3-fluorobenzonitrile (Compound 11)

[0388] 5-(4-((7-cyclopropyl-6-oxo-5, 6-dihydro-1, 5-naphthyridin-3-yl)methyl)piperazin-1-yl)-3-fluorobenzonitrile

[0389] Compound 11h (100 mg, 0.36 mmol), compound 1d (86 mg, 0.39 mmol), and N,N-diisopropylethylamine (230 mg, 1.8 mmol) were dissolved in acetonitrile (4 mL), reacted at 80°C for 4 hours, and the reaction solution was concentrated under reduced pressure. Prep-HPLC was used to separate and obtain compound 11 (white solid, 40 mg, yield 27%).

[0390] 1 H NMR (400 MHz, DMSO-d 6 )δ11.89(s, 1H), 8.37(d, 1H), 7.69(dd, 1H), 7.61-7.54(m, 2H), 7.41(s, 1H), 7.12(t, 1H), 3.6 3(s, 2H), 3.18(t, 4H), 2.54(t, 4H), 2.18-2.09(m, 1H), 1.00-0.92(m, 2H), 0.85-0.80(m, 2H).

[0391] LC-MS m / z(ESI)=404.46[M+1].

[0392] Example 12

[0393] 3-Cyclopropyl-7-((4-(5-fluoropyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 12)

[0394] 3-cyclopropyl-7-((4-(5-fluoropyridin-2-yl)piperazin-1-yl)methyl)-1, 5-naphthyridin-2(1H)-one

[0395]

[0396] The synthesis method of compound 12 is the same as that of compound 11. The reaction solution is concentrated under reduced pressure and separated using Prep-HPLC to obtain compound 12 (white solid, 12 mg, yield 24%).

[0397] 1 H NMR (400 MHz, DMSO-d 6)δ11.89(s, 1H), 8.37(d, 1H), 8.08(d, 1H), 7.60(d, 1H), 7.50(td, 1H), 7.41(s, 1H), 6.86(dd, 1H ), 3.61(s, 2H), 3.42(t, 4H), 2.49-2.43(m, 4H), 2.14(tt, 1H), 1.01-0.91(m, 2H), 0.82(dd, 2H).

[0398] LC-MS m / z(ESI)=380.44[M+1].

[0399] Embodiment 13

[0400] 6-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)nicotinonitrile (Compound 13)

[0401] 6-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)nicotinotrile

[0402]

[0403] The synthesis method of compound 13 is the same as that of compound 11. The reaction solution is concentrated under reduced pressure and separated by Prep-HPLC to obtain compound 13 (white solid, 16 mg, yield 22%).

[0404] 1 H NMR (400 MHz, DMSO-d 6 )δ11.63(s, 1H), 8.47(d, 1H), 8.37(d, 1H), 7.84(dd, 1H), 7.59(d, 1H), 7.41(s, 1H), 6.92(d, 1H ), 3.66(t, 4H), 3.61(s, 2H), 2.46(t, 4H), 2.13(ddt, 1H), 1.00-0.91(m, 2H), 0.86-0.76(m, 2H).

[0405] LC-MS m / z(ESI)=387.46[M+1].

[0406] Embodiment 14

[0407] 6-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)picolinonitrile (Compound 14)

[0408] 6-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)picolinonitrile

[0409]

[0410] first step

[0411] tert-Butyl 4-(5-cyanopyridin-2-yl)piperazine-1-carboxylate (14b)

[0412] tert-butyl 4-(5-cyanopyridin-2-yl)piperazine-1-carboxylate

[0413] According to the method of intermediate 1c, intermediate 14b (yellow solid, 1.2 g, yield 85%) was prepared.

[0414] LCMS m / s=289.16[M+1].

[0415] Step 2

[0416] 6-(Piperazin-1-yl)pyridinecarbonitrile (14c)

[0417] 6-(piperazin-1-yl)picolinonitrile

[0418] According to the method of intermediate 1d, intermediate 14c (yellow solid, 1.1 g, yield 90%) was prepared.

[0419] 1 H NMR (400 MHz, DMSO-d 6 )δ9.59(s, 1H), 8.54(d, 1H), 7.95(dd, 1H), 7.03(d, 1H), 3.91(t, 4H), 3.15(t, 4H).

[0420] LCMS m / s=189.10[M+1].

[0421] Step 3

[0422] 6-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)picolinonitrile (Compound 14)

[0423] 6-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)picolinonitrile

[0424] According to the method of compound 1, compound 14 (white solid, 43 mg, yield 65%) was prepared.

[0425] 1 H NMR (400 MHz, DMSO-d 6 )δ11.88(s, 1H), 8.47(d, 1H), 8.39(d, 1H), 7.84(dd, 1H), 7.74(s, 1H), 7.62(s, 1H), 6.93( d, 1H), 3.67-3.65 (m, 4H), 3.63 (s, 2H), 2.58-2.52 (m, 2H), 2.48-2.44 (m, 4H), 1.17 (t, 3H).

[0426] LCMS m / s=375.19[M+1].

[0427] Embodiment 15

[0428] 3-ethyl-7-((4-(5-(1-methyl-1H-pyrazol-5-yl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 15)

[0429] 3-ethyl-7-((4-(5-(1-methyl-1H-pyrazol-5-yl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one

[0430]

[0431] first step

[0432] 4-(5-Bromopyridin-2-yl)piperazine-1-carboxylic acid tert-butyl ester (15b)

[0433] tert-butyl 4-(5-bromopyridin-2-yl)piperazine-1-carboxylate

[0434] 5-Bromo-2-fluoropyridine compound 15a (1 g, 5.71 mmol) and tert-butylpiperazine-1-carboxylate compound 1b (1.17 g, 4.5 mmol) were dissolved in dimethyl sulfoxide (20 mL), potassium carbonate (1.18 g, 8.57 mmol) was added, and the reaction flask was reacted in an oil bath at 120°C. After 8 hours of reaction, water (60 mL) was added to quench the reaction, and a solid was precipitated. The solid was filtered and the filter cake was washed with water (3 mL*2). After drying, compound 15b (yellow solid, 1.7 g, yield 87%) was obtained.

[0435] LCMS m / s=342.07[M+1].

[0436] Step 2

[0437] 4-(5-(1-methyl-1H)tert-butylpyrazol-5-yl)pyridin-2-yl)piperazine-1-carboxylate (15c)

[0438] tert-butyl 4-(5-(1-methyl-1H-pyrazol-5-yl)pyridin-2-yl)piperazine-1-carboxylate

[0439] 4-(5-bromopyridin-2-yl)piperazine-1-carboxylic acid tert-butyl ester compound 15b (1.7 g, 5.00 mmol) and 1-methyl-1H-pyrazole-5-boronic acid pinacol ester (1.14 g, 5.50 mmol) were dissolved in 1,4-dioxane (20 mL), and (methanesulfonic acid (2-dicyclohexylphosphine-2′,4′,6′-triisopropyl-1,1′-biphenyl)(2′-methylamino-1,1′-biphenyl-2-yl)palladium (II) (430.25 mg, 0.5 mmol), cesium carbonate (3.26 g, 10.0 mmol), the reaction bottle was replaced with nitrogen and placed in a 120°C oil bath for reaction. After 16 hours of reaction, water (50 mL) was added to quench the reaction. Ethyl acetate (3×30 mL) was added for extraction. The organic phases were combined and concentrated under reduced pressure. The crude product was purified by column chromatography (PE: EA=3: 1) to give compound 15c (yellow solid, 1.5 g, yield 88%).

[0440] LCMS m / s=344.20[M+1].

[0441] Step 3

[0442] 1-(5-(1-methyl-1H-pyrazol-5-yl)pyridin-2-yl)piperazine (15d)

[0443] 1-(5-(1-methyl-1H-pyrazol-5-yl)pyridin-2-yl)piperazine

[0444] A solution of hydrochloric acid in 1,4-dioxane (4M, 15 mL) was added to compound 15c (1.5 g, 4.37 mmol), and the mixture was stirred at room temperature for 2 hours. The reaction solution was filtered and the filter cake was collected to obtain compound 15d (yellow solid, 902.62 mg, yield 85%).

[0445] LCMS m / s=244.15[M+1].

[0446] Step 4

[0447] 3-ethyl-7-((4-(5-(1-methyl-1H-pyrazol-5-yl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 15)

[0448] 3-ethyl-7-((4-(5-(1-methyl-1H-pyrazol-5-yl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one

[0449] Compound 15d (121.50 mg, 0.50 mmol) and compound 1e (133.00 mg, 0.50 mmol) were dissolved in acetonitrile (5 mL), and N,N-diisopropylethylamine (316 mg, 2.50 mmol) was added. The reaction system was replaced with nitrogen and placed in an oil bath at 70°C for 3 hours. The reaction solution was concentrated under reduced pressure to obtain a crude product, which was then purified by column chromatography (MeOH:DCM=1:60 to 1:15) to obtain compound 15 (white solid, 160.96 mg, yield: 75%).

[0450] 1 H NMR (400 MHz, DMSO-d 6 )δ11.86(s, 1H), 8.41(d, 1H), 8.25(d, 1H), 7.75(s, 1H), 7.69(dd, 1H), 7.63(s, 1H), 7.43(s, 1H), 6.92(d, 1 H), 6.34(s, 1H), 3.81(s, 3H), 3.64(s, 2H), 3.59-3.52(m, 4H), 3.36-3.33(m, 4H), 2.56(d, 2H), 1.18(t, 3H).

[0451] LCMS m / s=430.23[M+1].

[0452] Example 16

[0453] 6-(4-((2-ethyl-5-fluoro-3-oxo-3,4-dihydroquinoxalin-6-yl)methyl)piperazin-1-yl)nicotinonitrile (Compound 16)

[0454] 6-(4-((2-ethyl-5-fluoro-3-oxo-3,4-dihydroquinoxalin-6-yl)methyl)piperazin-1-yl)nicotinotrile

[0455]

[0456] first step

[0457] tert-Butyl 4-(5-cyanopyridin-2-yl)piperazine-1-carboxylate (16b)

[0458] tert-butyl 4-(5-cyanopyridin-2-yl)piperazine-1-carboxylate

[0459] According to the method of intermediate 1c, intermediate 6b (yellow solid, 1.2 g, yield 85%) was prepared.

[0460] LCMS m / s=289.16[M+1].

[0461] Step 2

[0462] 6-(Piperazin-1-yl)pyridinecarbonitrile (16c)

[0463] 6-(piperazin-1-yl)nicotinotrile

[0464] According to the method of intermediate 1d, intermediate 16c (yellow solid, 1.1 g, yield 90%) was prepared.

[0465] 1 H NMR (400 MHz, DMSO-d 6 )δ9.59(s, 1H), 8.54(d, 1H), 7.95(dd, 1H), 7.03(d, 1H), 3.91(t, 4H), 3.15(t, 4H).

[0466] LCMS m / s=189.10[M+1].

[0467] Step 3

[0468] 6-(4-((2-ethyl-5-fluoro-3-oxo-3,4-dihydroquinoxalin-6-yl)methyl)piperazin-1-yl)nicotinonitrile (Compound 16)

[0469] 6-(4-((2-ethyl-5-fluoro-3-oxo-3,4-dihydroquinoxalin-6-yl)methyl)piperazin-1-yl)nicotinotrile

[0470] Compound 16d was prepared according to the synthesis method of intermediate 66 in patent WO2021260092 (white solid 5 g, yield 76%), LCMS m / s = 286.00 [M+1].

[0471] According to the method of compound 1, compound 16 (white solid, 52 mg, yield 63%) was prepared.

[0472] 1 H NMR (400MHz, DMSO-d6) δ12.66 (s, 1H), 8.55 (s, 1H), 7.96 (d, 1H), 7.66 (d, 1H), 7.38 (t, 1H), 7.03 (d, 1H), 4.58-4.39 (m, 4H), 3.55 (s, 2H), 3.33-2.99 (m, 4H), 2.84 (q, 2H), 1.22 (t, 3H).

[0473] LCMS m / s=394.17[M+1].

[0474] Embodiment 17

[0475] 5-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)pyrazine-2-carbonitrile

[0476] (Compound 17)

[0477] 5-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)pyrazine-2-carbonitrile

[0478]

[0479]

[0480] first step

[0481] 4-(5-Cyanopyrazin-2-yl)piperazine-1-carboxylic acid tert-butyl ester (17b)

[0482] tert-butyl-4-(5-cyanopyrazin-2-yl)piperazine-1-carboxylate

[0483] According to the method of intermediate 1c, intermediate 17b (yellow solid, 1.3 g, yield 75%) was prepared.

[0484] LCMS m / s=290.15[M+1].

[0485] Step 2

[0486] 5-(Piperazin-1-yl)pyrazine-2-carbonitrile (17c)

[0487] 5-(piperazin-1-yl)pyrazine-2-carbonitrile

[0488] According to the method of intermediate 1d, intermediate 17c (yellow solid, 0.9 g, yield 90%) was prepared.

[0489] LCMS m / s=190.10[M+1].

[0490] Step 3

[0491] 5-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)pyrazine-2-carbonitrile (Compound 17)

[0492] 5-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)pyrazine-2-carbonitrile

[0493] According to the method of compound 1, compound 17 (white solid, 23 mg, yield 61%) was prepared.

[0494] 1 H NMR (400MHz, DMSO) δ11.89 (s, 1H), 8.75 (s, 2H), 8.37 (d, 1H), 7.59 (d, 1H), 7.41 (s, 1H), 3.84(t, 4H), 3.62(s, 2H), 2.46(t, 4H), 1.22(dt, 1H), 1.01-0.92(m, 2H), 0.82(dt, 2H).

[0495] LCMS m / s=388.19[M+1].

[0496] Embodiment 18

[0497] 6-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)pyridazine-3-carbonitrile (Compound 18)

[0498] 6-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)pyridazine-3-carbonitrile

[0499]

[0500] first step

[0501] tert-Butyl 4-(6-cyanopyridazin-3-yl)piperazine-1-carboxylate (18b)

[0502] tert-butyl-4-(6-cyanopyridazin-3-yl)piperazine-1-carboxylate

[0503] According to the method of intermediate 1c, intermediate 18b (yellow solid, 1.5 g, yield 80%) was prepared.

[0504] LCMS m / s=290.15[M+1].

[0505] Step 2

[0506] 6-(Piperazin-1-yl)pyridazine-3-carbonitrile (18c)

[0507] 6-(piperazin-1-yl)pyridazine-3-carbonitrile

[0508] According to the method of intermediate 1d, intermediate 18c (yellow solid, 1.1 g, yield 88%) was prepared.

[0509] LCMS m / s=190.10[M+1].

[0510] Step 3

[0511] 6-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)pyridazine-3-carbonitrile (Compound 18)

[0512] 6-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)pyridazine-3-carbonitrile

[0513] According to the method of compound 1, compound 18 (white solid, 23 mg, yield 61%) was prepared.

[0514] 1 H NMR (400MHz, DMSO) δ11.89 (s, 1H), 8.55 (d, 1H), 8.39 (d, 1H), 7.77-7.74 (m, 1H), 7.70 (dd, 1H), 7.65 (d, 1H), 3.64 (s, 2H), 3.53 (dd, 4H), 2.54 (d, 4H), 1.34 (t, 1H), 1.17-1.08 (m, 2H), 0.91-0.81 (m, 2H).

[0515] LCMS m / s=388.19[M+1].

[0516] Embodiment 19

[0517] 2-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)pyrimidine-5-carbonitrile (Compound 19)

[0518] 2-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)pyrimidine-5-carbonitrile

[0519]

[0520] first step

[0521] tert-Butyl 4-(5-cyanopyrimidin-2-yl)piperazine-1-carboxylate (19b)

[0522] tert-butyl-4-(5-cyanopyrimidin-2-yl)piperazine-1-carboxylate

[0523] According to the method of intermediate 1c, intermediate 19b (yellow solid, 1.1 g, yield 74%) was prepared.

[0524] LCMS m / s=290.15[M+1].

[0525] Step 2

[0526] 2-(Piperazin-1-yl)pyrimidine-5-carbonitrile (19c)

[0527] 2-(piperazin-1-yl)pyrimidine-5-carbonitrile

[0528] According to the method of intermediate 1d, intermediate 19c (yellow solid, 0.8 g, yield 89%) was prepared.

[0529] LCMS m / s=190.10[M+1].

[0530] Step 3

[0531] 2-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)pyrimidine-5-carbonitrile (Compound 19)

[0532] 2-(4-((7-cyclopropyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)pyrimidine-5-carbonitrile

[0533] According to the method of compound 1, compound 19 (white solid, 23 mg, yield 61%) was prepared.

[0534] 1 H NMR (400MHz, DMSO) δ11.89 (s, 1H), 8.78 (s, 2H), 8.34 (d, 1H), 7.57 (d, 1H), 7.43 (s, 1H), 3.93-3. 81(m, 4H), 3.61(s, 2H), 2.43-2.28(m, 4H), 1.21(dt, 1H), 1.01-0.94(m, 2H), 0.83-0.79(m, 2H).

[0535] LCMS m / s=388.19[M+1].

[0536] Embodiment 21

[0537] 3-ethyl-7-(4-(5-(1-methyl-1H-pyrazol-4-yl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 21)

[0538] 3-ethyl-7-((4-(5-(1-methyl-1H-pyrazol-4-yl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one

[0539]

[0540]

[0541] first step

[0542] tert-Butyl 4-(5-(1-methyl-1H-pyrazol-4-yl)pyridin-2-yl)piperazine-1-carboxylate (21a)

[0543] tert-butyl-4-(5-(1-methyl-1H-pyrazol-4-yl)pyridin-2-yl)piperazine-1-carboxylate

[0544] According to the method of intermediate 20d, intermediate 21a (yellow solid, 330 mg, yield 64%) was prepared

[0545] LCMS m / s=345.20[M+1].

[0546] Step 2

[0547] 1-(5-(1-methyl-1H-pyrazol-4-yl)pyridin-2-yl)piperazine (21b)

[0548] 1-(5-(1-methyl-1H-pyrazol-4-yl)pyridin-2-yl)piperazine

[0549] According to the method of intermediate 1d, intermediate 21b (yellow solid, 120 mg, yield 61%) was prepared.

[0550] LCMS m / s=244.15[M+1].

[0551] Step 3

[0552] 3-ethyl-7-(4-(5-(1-methyl-1H-pyrazol-4-yl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one (Compound 21)

[0553] 3-ethyl-7-((4-(5-(1-methyl-1H-pyrazol-4-yl)pyridin-2-yl)piperazin-1-yl)methyl)-1,5-naphthyridin-2(1H)-one

[0554] According to the method of compound 1, compound 21 (white solid, 30 mg, yield 71%) was prepared.

[0555] 1 H NMR (400MHz, DMSO) δ11.86 (s, 1H), 8.41 (s, 1H), 8.34 (s, 1H), 8.02 (s, 1H), 7.74-7.69 (m, 3H), 7.64 (s, 1H), 6.84 (d, 1H), 3.84 (s, 3H), 3.64-3.47 (m, 6H), 2.68-2.62 (m, 4H), 1.99 (t, 2H), 1.23 (s, 3H).

[0556] LCMS m / s=429.24[M+1]

[0557] Embodiment 22

[0558] 7-(4-(5-(1,3,4-oxadiazol-2-yl)pyridin-2-methyl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 22)

[0559] 7-((4-(5-(1,3,4-oxadiazol-2-yl)pyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0560]

[0561] first step

[0562] tert-Butyl 4-(5-(Methoxycarbonyl)pyridin-2-yl)piperazine-1-carboxylate (22b)

[0563] tert-butyl 4-(5-(methoxycarbonyl)pyridin-2-yl)piperazine-1-carboxylate

[0564] According to the method of intermediate 4c, intermediate 22b (white solid, 8.4 g, yield 76%) was prepared

[0565] LCMS m / s=322.17[M+1].

[0566] Step 2

[0567] tert-Butyl 4-(5-(hydrazinecarbonyl)pyridin-2-yl)piperazine-1-carboxylate (22c)

[0568] tert-butyl 4-(5-(hydrazinecarbonyl)pyridin-2-yl)piperazine-1-carboxylate

[0569] Intermediate 22b (2.0 g, 6.2 mmol) was added to hydrated hydrazine (3.2 g, 62 mmol), and then placed in an oil bath at 80°C for 24 h. After the reaction was completed, the mixture was concentrated under reduced pressure, 50 ml of ethyl acetate was added to dissolve the mixture, and the organic phase was washed with water and then treated with Na 2 SO 4 After drying, the solvent was evaporated under reduced pressure to give crude product 22c (yellow solid, 820 mg, yield 83%).

[0570] LCMS m / s=322.18[M+1].

[0571] Step 3

[0572] tert-Butyl 4-(5-(1,3,4-oxadiazol-2-yl)pyridine-2-methyl)piperazine-1-carboxylate (22d)

[0573] tert-butyl 4-(5-(1,3,4-oxadiazol-2-yl)pyridin-2-yl)piperazine-1-carboxylate

[0574] Intermediate 22c (500 mg, 1.6 mmol) was added to 50 ml of triethyl ester, heated to 150°C and reacted for 48 h. After the reaction was completed, the crude product was purified by silica gel chromatography (PE / EA=3 / 1) to obtain intermediate 22d (colorless oil, 210 mg, yield 39%).

[0575] Step 4

[0576] 2-(6-(Piperazin-1-yl)pyridin-3-yl)-1,3,4-oxadiazole (22e)

[0577] 2-(6-(piperazin-1-yl)pyridin-3-yl)-1,3,4-oxadiazole

[0578] According to the method of intermediate 1d, intermediate 22e (yellow solid, 82 mg, yield 86%) was prepared.

[0579] Step 5

[0580] 7-(4-(5-(1,3,4-oxadiazol-2-yl)pyridin-2-methyl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 22)

[0581] 7-((4v(5-(1,3,4-oxadiazol-2-yl)pyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0582] According to the method of compound 1, compound 22 (white solid, 42 mg, yield 81%) was prepared.

[0583] 1 H NMR (400MHz, DMSO) δ11.86 (s, 1H), 9.24 (s, 1H), 8.70 (d, 1H), 8.41 (d, 1H), 8.05 (dd, 1H), 7.75 (s, 1H), 7.63 (s, 1H), 7.00 (d, 1H), 3.65 (d, 6H), 3.32 (s, 4H), 2.58-2.52 (m, 2H), 1.18 (t, 3H)..

[0584] LCMS m / s=418.19[M+1]

[0585] Embodiment 23

[0586] 7-((4-(6-(difluoromethyl)pyridin-3-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 23)

[0587] 7-((4-(6-(difluoromethyl)pyridin-3-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0588]

[0589] first step

[0590] tert-Butyl 4-(6-(Difluoromethyl)pyridin-3-yl)piperazine-1-carboxylate (23b)

[0591] tert-butyl 4-(6-(difluoromethyl)pyridin-3-yl)piperazine-1-carboxylate

[0592] 5-Bromo-2-fluoromethylpyridine compound 23a (2 g, 9.61 mmol) and tert-butylpiperazine-1-carboxylate compound 1b (1.79 mg, 9.61 mmol) were dissolved in toluene (30 mL), and palladium acetate (215 mg, 0.96 mmol) and 1,1′-binaphthyl-2,2′-bisdiphenylphosphine (598 mg, 0.96 mmol) were added. The reaction flask was replaced with nitrogen and placed in an oil bath at 120°C for reaction. After 16 hours of reaction, water (40 mL) was added to quench the reaction. Ethyl acetate (6×30 mL) was added for extraction. The organic phases were combined and concentrated under reduced pressure. The crude product was purified by column chromatography (PE: EA=5:1) to obtain compound 23b (yellow solid, 1.89 g, yield 63%).

[0593] LCMS m / s=314.16[M+1].

[0594] Step 2:

[0595] 1-(6-(Difluoromethyl)pyridin-3-yl)piperazine (23c)

[0596] l-(6-(difluoromethyl)pyridin-3-yl)piperazine

[0597] A solution of hydrochloric acid in 1,4-dioxane (4M, 63.3 mL) was added to compound 23b (1.89 g, 6.03 mmol), and the mixture was stirred at room temperature for 16 hours. The reaction solution was filtered and the filter cake was collected to obtain compound 23c (yellow solid, 1.96 g, yield 94%).

[0598] LCMS m / s=214.11[M+1].

[0599] Step 3:

[0600] 7-((4-(6-(difluoromethyl)pyridin-3-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 23)

[0601] 7-((4-(6-(difluoromethyl)pyridin-3-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0602] Compound 1e was prepared according to the synthesis method of intermediate 14 in patent WO2021013735 (white solid 5 g, yield 76%), LCMS m / s = 267 [M+1].

[0603] Compound 23c (100 mg, 0.46 mmol) and compound 1e (83 mg, 0.37 mmol) were dissolved in acetonitrile (5 mL), and N,N-diisopropylethylamine (181 mg, 1.40 mmol) was added. The reaction system was replaced with nitrogen and placed in an oil bath at 70°C for 3 hours. The reaction solution was concentrated under reduced pressure to obtain a crude product, which was then purified by column chromatography (MeOH:DCM=1:60 to 1:15) to obtain compound 23 (white solid, 65 mg, yield: 34%).

[0604] 1 H NMR (400MHz, DMSO-d6) δ11.86 (s, 1H), 8.42-8.38 (m, 1H), 8.35 (d, J = 2.7Hz, 1H), 7.75 (s, 1H), 7.62 (s, 1H), 7.49 (d, J = 8.8 Hz, 1H), 7.44-7.39 (m, 1H), 6.95-6.65 (m, 1H), 3.64 (s, 2H), 3.32-3.27 (m, 4H), 2.59-2.51 (m, 6H), 1.18 (t, J=7.4Hz, 3H).

[0605] LCMS m / s=400.02[M+1].

[0606] Embodiment 24

[0607] 7-((4-(5-(difluoromethyl)pyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthothiidine-2(1H)-one (Compound 24)

[0608] 7-((4-(5-(difluoromethyl)pyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0609]

[0610]

[0611] first step

[0612] tert-Butyl 4-(5-(Difluoromethyl)pyridin-2-yl)piperazine-1-carboxylate (24b)

[0613] tert-butyl 4-(5-(difluoromethyl)pyridin-2-yl)piperazine-1-carboxylate

[0614] According to the method of intermediate 1c, intermediate 24b (yellow solid, 1.8 g, yield 85%) was prepared.

[0615] LCMS m / s=314.16[M+1].

[0616] Step 2

[0617] 1-(5-(Difluoromethyl)pyridin-2-yl)piperazine (24c)

[0618] 1-(5-(difluoromethyl)pyridin-2-yl)piperazine

[0619] 2- According to the method of intermediate 1d, intermediate 24d (yellow solid, 1.1 g, yield 92%) was prepared.

[0620] LCMS m / s=214.11[M+1].

[0621] Step 3

[0622] 7-((4-(5-(difluoromethyl)pyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 24)

[0623] 7-((4-(5-(difluoromethyl)pyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0624] According to the method of compound 1, compound 24 (white solid, 30 mg, yield 43%) was prepared.

[0625] 1 H NMR (400MHz, DMSO-d6) δ11.86 (s, 1H), 8.42-8.38 (m, 1H), 8.34 (d, J = 2.7Hz, 1H), 7.75 (s, 1H), 7.62 (s, 1H), 7.48 (d, J = 8.8 Hz, 1H), 7.44-7.39 (m, 1H), 6.97-6.67 (m, 1H), 3.65 (s, 2H), 3.34-3.29 (m, 4H), 2.60-2.52 (m, 6H), 1.18 (t, J=7.4Hz, 3H).

[0626] LCMS m / s=400.19[M+1].

[0627] Embodiment 25

[0628] 7-((4-(5-(difluoromethoxy)pyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 25)

[0629] 7-((4-(5-(difluoromethoxy)pyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0630]

[0631] first step

[0632] tert-Butyl 4-(5-(difluoromethoxy)pyridin-2-yl)piperazine-1-carboxylate (25b)

[0633] tert-butyl 4-(5-(difluoromethoxy)pyridin-2-yl)piperazine-1-carboxylate

[0634] According to the method of intermediate 1c, intermediate 25b (reddish brown solid, 2.35 g, yield 79%) was prepared.

[0635] LCMS m / s=330.16[M+1].

[0636] Step 2

[0637] 1-(5-(Difluoromethoxy)pyridin-2-yl)piperazine (25c)

[0638] 1-(5-(difluoromethoxy)pyridin-2-yl)piperazine

[0639] According to the method of intermediate 1d, intermediate 25c (yellow solid, 2.2 g, yield 95%) was prepared.

[0640] LCMS m / s=230.10[M+1].

[0641] Step 3

[0642] 7-((4-(5-(difluoromethoxy)pyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 25)

[0643] 7-((4-(5-(difluoromethoxy)pyridin-2-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0644] According to the method of compound 1, compound 25 (brown solid, 75 mg, yield 41%) was prepared.

[0645] 1 H NMR (400MHz, DMSO-d6) δ11.86 (s, 1H), 8.40 (d, J=1.4Hz, 1H), 8.01 (d, J=2.9Hz, 1H), 7.75 (s, 1H), 7.62 (s, 1H), 7.47-7.41 (m, 1H), 7.1 4 (d, J=74.3Hz, 1H), 6.89-6.85 (m, 1H), 3.62 (s, 2H), 3.49-3.44 (m, 4H), 2.57-2.50 (m, 4H), 2.48-2.44 (m, 2H), 1.18 (t, J=7.4Hz, 3H).

[0646] LCMS m / s=416.18[M+1].

[0647] Embodiment 26

[0648] 6-(4-((7-methyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)nicotinonitrile (Compound 26)

[0649] 6-(4-((7-methyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)nicotinotrile

[0650]

[0651] first step

[0652] tert-Butyl 4-(5-cyanopyridin-2-yl)piperazine-1-carboxylate (26b)

[0653] tert-butyl 4-(5-cyanopyridin-2-yl)piperazine-1-carboxylate

[0654] According to the method of intermediate 1c, intermediate 26b (brown solid, 2.47 g, yield 75%) was prepared.

[0655] LCMS m / s=289.16[M+1].

[0656] Step 2

[0657] 6-(Piperazin-1-yl)nicotinonitrile (26c)

[0658] 6-(piperazin-1-yl)nicotinotrile

[0659] According to the method of intermediate 1d, intermediate 26c (yellow solid, 2.1 g, yield 92%) was prepared.

[0660] LCMS m / s=189.11[M+1].

[0661] Step 3

[0662] 6-(4-((7-methyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)nicotinonitrile (Compound 26)

[0663] 6-(4-((7-methyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)nicotinotrile

[0664] Compound 26d was prepared according to patent WO2021013735A1

[0665] According to the method of compound 1, compound 26 (white solid, 88 mg, yield 33%) was prepared.

[0666] 1 H NMR (400MHz, DMSO-d6) δ11.87 (s, 1H), 8.47 (d, J = 2.3Hz, 1H), 8.38 (d, J = 1.6Hz, 1H), 7.86-7.80 (m, 2H) , 7.61 (s, 1H), 6.92 (d, J=9.2Hz, 1H), 3.69-3.64 (m, 4H), 3.62 (s, 2H), 2.49-2.45 (m, 4H), 2.13 (s, 3H).

[0667] LCMS m / s=361.17[M+1].

[0668] Embodiment 27

[0669] 2-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)thiazole-5-carbonitrile (Compound 27)

[0670] 2-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)thiazole-5-carbonitrile

[0671]

[0672] first step

[0673] tert-Butyl 4-(5-cyanothiazol-2-yl)piperazine-1-carboxylate (27b)

[0674] tert-butyl 4-(5-cyanothiazol-2-yl)piperazine-1-carboxylate

[0675] 2-Bromothiazole-5-carbonitrile compound 27a (1 g, 5.30 mmol) and tert-butylpiperazine-1-carboxylate compound 1b (1.08 g, 5.82 mmol) were dissolved in toluene (15 mL), and palladium acetate (119 mg, 0.53 mmol), 1,1′-binaphthyl-2,2′-bisdiphenylphosphine (330 mg, 0.53 mmol), and cesium carbonate (6.9 g, 21.3 mmol) were added. The reaction flask was replaced with nitrogen and placed in an oil bath at 120°C for reaction. After 16 hours of reaction, water (20 mL) was added to quench the reaction, and ethyl acetate (3×30 mL) was added for extraction. The organic phases were combined and concentrated under reduced pressure. The crude product was purified by column chromatography (PE: EA=5: 1) to obtain compound 27b (yellow solid, 1.5 g, yield 96%).

[0676] 1 H NMR (400 MHz, DMSO-d 6 )δ8.05(s, 1H), 3.57-3.51(m, 4H), 3.50-3.43(m, 4H), 1.42(s, 9H).

[0677] LCMS m / s=294.10[M+1].

[0678] Step 2

[0679] 2-(Piperazin-1-yl)thiazole-5-carbonitrile (Compound 27c)

[0680] 2-(piperazin-1-yl)thiazole-5-carbonitrile

[0681] A solution of hydrochloric acid in 1,4-dioxane (4 M, 15 mL) was added to compound 27b (1.5 g, 5 mmol), and the mixture was stirred at room temperature for 2 hours. The reaction solution was filtered and the filter cake was collected to obtain compound 27c (yellow solid, 900 mg, yield 91%).

[0682] LCMS m / s=194.10[M+1].

[0683] Step 3

[0684] 2-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)thiazole-5-carbonitrile (Compound 27)

[0685] 2-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)thiazole-5-carbonitrile

[0686] Compound 1e was prepared according to the synthesis method of intermediate 14 in patent WO2021013735 (white solid 5 g, yield 76%), LCMS m / s = 267 [M+1].

[0687] Compound 27c (100 mg, 0.51 mmol) and compound 1e (123 mg, 0.46 mmol) were dissolved in acetonitrile (5 mL), and N,N-diisopropylethylamine (297 mg, 2.3 mmol) was added. The reaction system was replaced with nitrogen and placed in a 90°C oil bath for 3 hours. The reaction solution was concentrated under reduced pressure to obtain a crude product, which was then purified by column chromatography (MeOH:DCM=1:60 to 1:15) to obtain compound 27 (white solid, 100 mg, yield 57%).

[0688] 1 H NMR (400 MHz, DMSO-d 6 )δ11.88(s, 1H), 8.39(d, 1H), 8.03(s, 1H), 7.75(s, 1H), 7.60(d, 1H), 3.65(s, 2H), 3.60-3.50(m, 4H), 2.54-2.52(m, 6H), 1.17(t, 3H).

[0689] LCMS m / s=381.20[M+1].

[0690] Embodiment 28

[0691] 2-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)thiazole-4-carbonitrile (Compound 28)

[0692] 2-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)thiazole-

[0693]

[0694] first step

[0695] 4-(4-Cyanothiazol-2-yl)piperazine-1-carboxylic acid tert-butyl ester (Compound 28b)

[0696] tert-butyl 4-(4-cyanothiazol-2-yl)piperazine-1-carboxylate

[0697] 2-Bromothiazole-4-carbonitrile compound 28a (1 g, 5.30 mmol) and tert-butylpiperazine-1-carboxylate compound 1b (1.08 g, 5.82 mmol) were dissolved in toluene (15 mL), and palladium acetate (119 mg, 0.53 mmol), 1,1′-binaphthyl-2,2′-bisdiphenylphosphine (330 mg, 0.53 mmol), and cesium carbonate (6.9 g, 21.3 mmol) were added. The reaction flask was replaced with nitrogen and placed in an oil bath at 120°C for reaction. After 16 hours of reaction, water (20 mL) was added to quench the reaction, and ethyl acetate (3×30 mL) was added for extraction. The organic phases were combined and concentrated under reduced pressure. The crude product was purified by column chromatography (PE: EA=5:1) to obtain compound 28b (yellow solid, 100 mg, yield 6%).

[0698] 1 H NMR (400 MHz, DMSO-d 6 )δ8.00(s, 1H), 3.44(s, 8H), 1.42(s, 10H).

[0699] LCMS m / s=294.10[M+1].

[0700] Step 2

[0701] 2-(Piperazin-1-yl)thiazole-4-carbonitrile (Compound 28c)

[0702] 2-(piperazin-1-yl)thiazole-4-carbonitrile

[0703] A solution of hydrochloric acid in 1,4-dioxane (4 M, 2 mL) was added to compound 28b (100 mg, 0.33 mmol). The mixture was stirred at room temperature for 2 hours. The reaction solution was filtered and the filter cake was collected to obtain compound 28c (yellow solid, 60 mg, yield 92%).

[0704] LCMS m / s=194.10[M+1].

[0705] Step 3

[0706] 2-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)thiazole-4-carbonitrile 2-(4-((3-ethyl-2-oxo-1,2-dihydroquinolin-7-yl)methyl)piperazin-1-yl)thiazole-4-carbonitrile (Compound 28)

[0707] 2-(4-((7-ethyl-6-oxo-5,6-dihydro-1,5-naphthyridin-3-yl)methyl)piperazin-1-yl)thiazole-4-carbonitrile Compound 28c (60 mg, 0.31 mmol) and compound 1e (91 mg, 0.34 mmol) were dissolved in acetonitrile (5 mL), and N,N-diisopropylethylamine (219 mg, 1.7 mmol) was added. The reaction system was replaced with nitrogen and placed in an oil bath at 90°C for 3 hours. The reaction solution was concentrated under reduced pressure to obtain a crude product, which was then purified by column chromatography (MeOH:DCM=1:60 to 1:15) to obtain compound 28 (white solid, 50 mg, yield 38%).

[0708] 1 H NMR (400 MHz, DMSO-d 6 )δ11.87(s, 1H), 8.39(d, 1H), 7.98(s, 1H), 7.74(s, 1H), 7.60(d, 1H), 3.64(s, 2H), 3.55-3.39(m, 4H), 2.54-2.52(m, 6H), 1.17(t, 3H).

[0709] LCMS m / s=381.20[M+1].

[0710] Embodiment 29

[0711] 7-((4-(6-(difluoromethoxy)pyridin-3-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 29)

[0712] 7-((4-(6-(difluoromethoxy)pyridin-3-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one

[0713]

[0714] first step

[0715] 4-(6-(Difluoromethoxy)pyridin-3-yl)piperazine-1-carboxylic acid tert-butyl ester (Compound 29b)

[0716] tert-butyl 4-(6-(difluoromethoxy)pyridin-3-yl)piperazine-1-carboxylate

[0717] 5-Bromo-2-(difluoromethoxy)pyridine compound 29a (500 mg, 2.23 mmol) and tert-butylpiperazine-1-carboxylate compound 1b (457 mg, 2.45 mmol) were dissolved in toluene (10 mL), and palladium acetate (50 mg, 0.22 mmol), 1,1′-binaphthyl-2,2′-bisdiphenylphosphine (137 mg, 0.22 mmol), and cesium carbonate (2.9 g, 8.92 mmol) were added. The reaction flask was replaced with nitrogen and placed in an oil bath at 120°C for reaction. After 16 hours of reaction, water (10 mL) was added for quenching, and ethyl acetate (3×10 mL) was added for extraction. The organic phases were combined and concentrated under reduced pressure. The crude product was purified by column chromatography (PE: EA=5:1) to obtain compound 29b (yellow solid, 700 mg, yield 95%).

[0718] 1 H NMR (400 MHz, DMSO-d 6 )δ7.89 (d, 1H), 7.58 (dd, 1H), 7.56 (t, 1H), 6.98 (d, 1H), 3.47-3.44 (m, 4H), 3.14-3.03 (m, 4H), 1.42 (s, 9H).

[0719] LCMS m / s=329.20[M+1].

[0720] Step 2

[0721] 1-(6-(Difluoromethoxy)pyridin-3-yl)piperazine (Compound 29c)

[0722] 1-(6-(difluoromethoxy)pyridin-3-yl)piperazine

[0723] A solution of hydrochloric acid in 1,4-dioxane (4 M, 4 mL) was added to compound 29b (700 mg, 2.13 mmol). The mixture was stirred at room temperature for 2 hours. The reaction solution was filtered and the filter cake was collected to obtain compound 29c (yellow solid, 450 mg, yield 92%).

[0724] LCMS m / s=229.10[M+1].

[0725] Step 3

[0726] 7-((4-(6-(difluoromethoxy)pyridin-3-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one (Compound 29)

[0727] 7-((4-(6-(difluoromethoxy)pyridin-3-yl)piperazin-1-yl)methyl)-3-ethyl-1,5-naphthyridin-2(1H)-one Compound 29c (50 mg, 0.22 mmol) and compound 1e (52 mg, 0.20 mmol) were dissolved in acetonitrile (5 mL), and N,N-diisopropylethylamine (129 mg, 1.0 mmol) was added. The reaction system was replaced with nitrogen and placed in an oil bath at 90°C for 3 hours. The reaction solution was concentrated under reduced pressure to obtain a crude product, which was then purified by column chromatography (MeOH:DCM=1:60 to 1:15) to obtain compound 29 (white solid, 20 mg, yield 25%).

[0728] 1 H NMR (400 MHz, DMSO-d 6 )δ11.85(s,1H),8.40(d,1H),7.87(d,1H),7.75(s,1H),7.62(s,1H),7.57(dd,1H),7.5 4(t, 1H), 6.96(d, 1H), 3.64(s, 2H), 3.22-3.07(m, 4H), 2.56-2.53(m, 6H), 1.18(t, 3H).

[0729] LCMS m / s=416.20[M+1].

[0730] Biological experiments

[0731] 1. PARP1 and PARP2 enzyme activity inhibition experiment

[0732] This experiment used PARP1 Chemiluminescent assay (BPS, Cat No.: 80551) and PARP2 Chemiluminescent assay (BPS, Cat No.: 80552) to detect the inhibition of the test compounds on PARP1 and PARP2 enzyme activities, respectively. The specific experimental method is: use the histone mixture to coat the 96-well plate overnight, and then add the blocking buffer and incubate at room temperature for 90 minutes. Then add the test compound, PARP enzyme and biotin-labeled substrate and incubate at room temperature for 1 hour. After the incubation, add streptavidin-labeled HRP and incubate at room temperature for 30 minutes. Finally, add the ELISA ECL substrate A / B mixture and immediately use the microplate reader for bioluminescence detection. Calculate the IC using GraphPad Prism 8 software 50 .

[0733] The results show that the compounds of the present invention have significant biological inhibitory activity against PARP1 and have good selectivity relative to PARP2.

[0734] 2. PARP1 and PARP2 trapping experiments

[0735] 2.1 PARP1 trapping experiment

[0736] PARP1 (BPS, Cat No.: 80501) and Mab anti GST-Tb cryptate (cisbio, Cat No.: 61GSTTL) were first added to a 384-well plate, and then DSB DNA probe-1 (Generay) and the test compound were added and incubated at room temperature for 45 minutes. NAD (Sigma, Cat No.: 10127965001) was then added and incubated at room temperature for 10 minutes, and TR-FRET detection was performed using Envision 2105 (PerkinElmer). IC was calculated using GraphPad Prism 8 software. 50 , the results are shown in Table 1.

[0737] 2.2 PARP2 trapping experiment

[0738] PARP2 (BPS, Cat No.: 80502) and Mab anti GST-Tb cryptate (cisbio, Cat No.: 61GSTTL) were first added to a 384-well plate, and then PARP2 probe2 (Generay) and the test compound were added and incubated at room temperature for 45 minutes. NAD (Sigma, Cat No.: 10127965001) was then added and incubated at room temperature for 10 minutes. Finally, Envision 2105 (PerkinElmer) was used for TR-FRET detection. IC was calculated using GraphPad Prism 8 software. 50 , the results are shown in Table 1.

[0739] Table 1. PARP1 and PARP2 trapping experimental results

[0740]

[0741] Note: Reference Example 1 is compound 25 of J. Med. Chem (2021), 64 (19), 14498-14512, which was obtained according to the preparation method of compound 25.

[0742] The results show that the compounds of the present invention have significant inhibitory activity on PARP1 trapping and have good selectivity relative to PARP2 trapping.

[0743] 3. Cell proliferation inhibition experiment

[0744] 3.1 DLD-1 BRCA2 - / - Cell proliferation inhibition assay

[0745] Human colorectal adenocarcinoma epithelial cell line DLD-1BRCA2 - / - The cells were cultured in RPMI-1640 medium containing 10% FBS, 1% double antibody, 1% LG and 0.1 mg / mL hygromycin at 37°C and 5% CO. 2 By cell counting, 1000 DLD-1 BRCA2 cells were added to each well. - / - The cells were seeded in 96-well plates and cultured overnight. The test compound was added the next day, starting from the highest dose of 10 μM, and then diluted 2-fold, with a total of 9 gradient concentrations. At the same time, blank control wells containing the same DMSO concentration were set. The cells were cultured at 37°C and 5% CO 2 After 7 days of culture, CellTiter- Reagent, chemiluminescence value was measured by microplate reader. IC was calculated by GraphPad Prism 8 software. 50 , the results are shown in Table 2.

[0746] Table 2. Effects of the compounds of the present invention on DLD-1 BRCA2 - / - Cell proliferation inhibition assay

[0747] Compound <![CDATA[IC 50 (nM) <!-- 46 -->]]> 1 1.7 3 3.3 4 5.4

[0748] The results showed that the compounds of the present invention have an effect on DLD1 BRCA2 - / - It has a significant inhibitory effect on cell proliferation.

[0749] 3.2 MDA-MB-436 cell proliferation inhibition experiment

[0750] Human breast cancer cell line MDA-MB-436 (supplier ATCC, Cat#HTB-130) was cultured in L15 medium containing 10% FBS and 1% double antibody at 37°C and 5% CO 2 . By cell counting, 400 MDA-MB-436 cells were seeded in each well of a 384-well plate and cultured overnight. The test compound was added the next day, starting from the highest dose of 10 μM, and then diluted 3-fold, with a total of 10 gradient concentrations. At the same time, a blank control well containing 0.1% DMSO was set. The cells were incubated at 37°C with 5% CO 2 After 7 days of culture, the Celltiter Glo assay kit was added and the chemiluminescence value was measured using an enzyme reader. The IC 50 , the results are shown in Table 3.

[0751] Table 3. Experimental study on the inhibition of proliferation of MDA-MB-436 cells by the compounds of the present invention

[0752]

[0753]

[0754] Note: Reference Example 2 is compound 17 of patent WO2009053373, which is obtained according to the preparation method of compound 17.

[0755] The results showed that the compound of the present invention had a significant inhibitory effect on the proliferation of MDA-MB-436 cells.

[0756] 4. Evaluation of bidirectional permeability using MDCK-MDR1 cell model

[0757] This experiment used a monolayer of MDCK-MDR1 cells, which were incubated in a 96-well Transwell plate. A transport buffer solution containing 1 μM of the test compound was added to the appropriate dosing port well on the apical side or basolateral side, and a transport buffer solution containing DMSO was added to the appropriate receiving port well. After incubation at 37°C for 2 hours, the cell plate was removed and 50 μ samples were taken from the top and bottom to a new 96-well plate, followed by the addition of acetonitrile to precipitate the protein. The samples were analyzed using LC-MS / MS and the concentration of the test compound was determined. The concentration data was used to calculate the apparent permeability coefficient for transport from the apical side to the basolateral side and the basolateral side to the apical side of the monolayer cells, thereby calculating the efflux rate. The leakage of fluorescent yellow was used to evaluate the integrity of the monolayer cells after 2 hours of incubation. The permeation results of the test compounds in the monolayer MDCK-MDR1 cells are shown in Table 4.

[0758] Table 4. Permeation results of the compounds of the present invention in monolayer MDCK-MDR1 cells

[0759]

[0760] Note: Reference Example 1 is compound 25 of J. Med. Chem (2021), 64 (19), 14498-14512, which was obtained according to the preparation method of compound 25.

[0761] The results show that the compounds of the present invention have higher cell membrane permeability and lower efflux rate than the control examples.

[0762] 5. Pharmacokinetics in mice

[0763] Accurately weigh the appropriate amount of drug, use 30% DMSO and 30% HP-β-CD to prepare the test compound into a 0.1 mg / mL solution for intravenous administration, and use 0.5% MC to prepare the test compound into a 0.1 mg / mL solution for oral administration. After fasting overnight, healthy adult male ICR mice were given the test compound by intravenous injection (0.5 mg / kg) and oral gavage (1 mg / kg). At different time points after administration (0.083h, 0.25h, 0.5h, 1h, 2h, 4h, 8h, 24h), blood was collected from the forelimb vein (heparin sodium anticoagulation). The blood samples were centrifuged at 4℃ 6800g for 10 minutes to separate the plasma, and all samples were stored at -80℃ for testing. The plasma prototype drug concentration was determined by LC-MS / MS, and the main pharmacokinetic parameters were calculated using Phoenix WinNonlin7.0. The results are shown in Table 5.

[0764] Table 5. Pharmacokinetic properties of the compounds of the present invention in ICR mice

[0765]

[0766] Note: Reference Example 1 is compound 25 of J. Med. Chem (2021), 64 (19), 14498-14512, which was obtained according to the preparation method of compound 25.

[0767] The results showed that the compound of the present application showed significantly better pharmacokinetic characteristics in mice than the control example.

[0768] 6. Detection of compound distribution in rat brain tissue

[0769] Accurately weigh an appropriate amount of drug and use 0.5% MC to prepare the test substance into a 0.2 mg / mL solution. After fasting overnight, healthy adult male SD rats were gavaged with the test substance (1 mg / kg) or blank solvent. Blood was collected from the orbital venous plexus at different time points after administration (EDTA-K 2 Anticoagulation) was performed, and the animals were then killed and brain tissue samples were collected. Blood samples were centrifuged at 4°C, 6000g for 5 min to separate plasma, and all samples were stored at -80°C for testing. The drug concentration of the compound in brain tissue was determined by LC-MS / MS, and the brain tissue samples were homogenized before testing. The main pharmacokinetic parameters were calculated using the Winnolin 8.3 non-compartmental model.

[0770] The results show that the compound of the present application has good blood-brain barrier penetration ability.

[0771] 7.DLD-1 BRCA2- / - tumor transplant efficacy test

[0772] Human colorectal adenocarcinoma epithelial cells DLD-1 BRCA2- / - were cultured in RPMI-1640 medium containing 10% FBS and 1% double antibody. When the cell confluence reached 80-90%, the cells were digested and centrifuged and counted, and then the matrix gel and cell suspension were mixed in a ratio of 1:1 and inoculated subcutaneously in the right rib of BALB / c nude mice. The inoculated cell amount was 5×10 6 / mouse, the inoculation volume is 0.2mL. When the tumor grows to 160mm 3Around 2.5 hours, the mice were grouped according to the S-type according to the size of the tumor, and were divided into 6 groups, including Vehicle, Control 1 (0.1, 1, 10 mpk) and Compound 14 (1 and 10 mpk), with 8 mice in each group. The test compound was prepared with 0.5% MC and administered orally at a dosage volume of 10 mL / kg, once a day for a total of 28 days. During the administration period, the tumor volume and mouse weight were measured twice a week, and the tumor growth curve and mouse weight change curve were drawn. At the last administration, blood samples were collected from the orbital venous plexus of mice at different time points (0h, 0.5h, 1h, 2h, 4h, 6h, 8h, 12h, 24h), and plasma was collected after centrifugation for drug concentration detection. In addition, during the last administration period, the tumors of mice administered for 1h, 6h and 24h were removed at the same time, and the drug concentration in the tumor was detected after grinding.

[0773] The results showed that: compared with the control example, the compound of the present application had a higher concentration in tumor tissue, and the compound of the present application showed significantly better efficacy than the control example in the transplantation model.

[0774] The specification of the present invention describes the specific implementation scheme in detail. Those skilled in the art should recognize that the above implementation scheme is exemplary and cannot be understood as limiting the present invention. For those skilled in the art, without departing from the principle of the present invention, by making several improvements and modifications to the present invention, the technical solutions obtained by these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A compound or a stereoisomer thereof, in, The compound is selected from:

2. A pharmaceutical composition, the pharmaceutical composition include: (1) The compound according to claim 1 or a stereoisomer thereof; (2) one or more other active ingredients; as well as (3) Pharmaceutically acceptable carriers and / or excipients.

3. Use of the pharmaceutical composition according to claim 2 or the compound or its stereoisomer according to claim 1 in the preparation of an anti-tumor drug, wherein the tumor is colorectal adenocarcinoma or breast cancer.

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