216 results about "2-Aminopyridine" patented technology

Pharmaceutical formulations including an immune response modifier (IRM) compound having a 2-aminopyridine moiety fused to a five-membered nitrogen-containing heterocyclic ring; a preservative system including a sorbic acid preservative selected from the group consisting of sorbic acid, esters thereof, salts thereof, and combinations thereof; an antioxidant; and an optional chelating agent.

2-Aminopyridine compounds having the structure of Formula I, and pharmaceutically acceptable salts of these compounds. Compounds of Formula I inhibit the activity of tyrosine kinase enzymes in animals, including humans, and are useful in the treatment and/or prevention of various diseases and conditions. In particular, compounds disclosed herein are inhibitors of kinases, in particular, but not limited to, KDR, Tie-2, Flt3, FGFR3, Ab1, Aurora A, c-Src, IGF-1R, ALK, c-MET, RON, PAK1, PAK2, and TAK1, and can be used in the treatment of proliferative diseases, such as, but not limited to, cancer. The present invention is also directed to a pharmaceutical composition comprising a therapeutically effective amount of a compound of Formula I, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier. The present invention is further directed to a method of treating a patient having a condition which is mediated by protein kinase activity by administering to the patient a therapeutically effective amount of the above-mentioned pharmaceutical composition.

The present invention provides 2-aminopyridine compound having an excellent adenosine receptor (A1, A2a, A2b receptors) antagonism, which is represented by the following formula: (wherein, R<1 >represents cyano group, carboxyl group or an optionally substituted carbamoyl group; R<2 >represents hydrogen atom, hydroxyl group, an optionally substituted C1-6 alkoxy group, an optionally substituted C6-14 aromatic hydrocarbon cyclic group or an optionally substituted 5- to 14-membered aromatic heterocyclic group; and R<3 >and R<4 >are the same as or different from each other and each represents a C6-14 aromatic hydrocarbon cyclic group, a 5- to 14-membered non-aromatic heterocyclic group or a 5- to 14-membered aromatic heterocyclic group which may be substituted, respectively) or a salt thereof.

The invention provides a treatment and recovery method of 2-aminopyridine production waste water, comprising separating organic layer from waste water via an oil separation pool, depressurizing, distilling and recovering 2-aminopyridine, adjusting pH of aqueous layer via a diluted acid until neutral, cooling, crystallizing, depressurizing, extracting and filtering to obtain crude salt, purifying and recovering inorganic salt via recrystallization, using adsorption column stuffed with high-crosslinked adsorption resin to absorb and remove organics, collecting effluent to be used for hydrolysis or be discharged via biochemical treatment, eluting the adsorption resin via sodium-hydroxide-alcohol solution to be regenerated via methanol to be repeatedly used, neutralizing and combining the desorption solution and organic layer, distilling to recover 2-aminopyridine. The treatment and recovery method of 2-aminopyridine production waste water has the advantages of improved waste water treatment effect and recovered useful material in waste water, thereby reducing pollution, saving cost and combining waste water treatment and resource recovery.

The invention provides chemical copper-plating solution and a chemical copper-plating method. The chemical copper-plating solution comprises copper salt, nickel salt, sodium monophosphate, a complexing agent, a stabilizing agent and water solution of a potential of hydrogen (pH) conditioning agent. The stabilizing agent contains 2-aminopyridine and 4 cyanopyridine. The complexing agent comprises triethanolamine and citrate, the content ratio of the triethanolamine to the citrate is 1:1-5:1, and the pH value of the chemical copper-plating solution is 8-11. By adopting the chemical copper-plating solution with the sodium monophosphate serving as a reducing agent, the thickness of a plating layer can reach 3-7 micrometers, so that the largest thickness of a traditional technology is greatly improved.

The invention discloses a method for preparing minodronate, which comprises the following steps of: condensing a compound II and a compound III to form a compound IV, closing rings of the compound IV and 2-aminopyridine to obtain a compound V, hydrolyzing the compound V into a compound VI, and finally performing phosphonation to form a compound I. The method avoids using virulent chemical reagents such as sodium cyanide or bromine and the like, has mild and controllable reaction condition, short reaction step, high yield and low cost, and is suitable for industrialized production.

The invention relates to a method for preparing 2-(imidazo[1,2-a]pyridine-2-pyridinyl) acetic acid of a compound in a formula (I). In the method, trans-4-oxo-2-crotonate and 2-aminopyridine in a compound of a formula (II) perform a condensation reaction, and are hydrolyzed to form the compound of the formula (I). The compound is an important intermediate for preparing the minodronate.

The invention relates to the field of pharmaceutical chemistry, in particular to a synthesis method of a minodronate midbody and synthesis of minodronate. The preparation method of minodronate includes the following steps: using organic solvent to dissolve 2-aminopyridine, adding 4-acetyl chloride ethyl acetoacetate for reaction, monitoring the reaction solution by TLC(Thin-Layer Chromatography) until spots of 4-acetyl chloride ethyl acetoacetate disappear, concentrating to a dry state, dissolving concentrate in water, washing a water layer to remove impurities, extracting the water layer with the organic solvent, washing extract liquor, separating out an organic layer, conducting filtration, and concentrating the concentrate to be in a dry state, thereby obtaining A1.

The invention discloses a substituted 2-aminopyridine inhibitor for protein kinase, and concretely relates to 2-aminopyridine derivatives with protein kinase inhibition activity, a preparation method thereof, and pharmaceutical compositions thereof, and the invention also discloses application of the compounds and the pharmaceutical compositions thereof to treat diseases related to protein kinase.

The invention belongs to the fields of organic synthesis and metal catalysis, and discloses a method for preparing a pyridinoquinazolinone compound through the catalysis of a copper compound. The method comprises the following steps: adding a benzamide derivative, a 2-aminopyridine derivative, a catalyst, an oxidizing agent and a solvent into a closed pipe in an air environment; then performing aheating reaction; and after the reaction is completed, purifying the obtained reaction solution to obtain the required pyridinoquinazolinone compound. According to the method, a C-H activation cascadereaction is performed on the benzamide derivative and the 2-aminopyridine derivative under the catalytic action of the copper compound in the presence of the oxidizing agent in the air environment and the closed environment, thereby generating the pyridinoquinazolinone; the method can be performed in the air environment; and the used raw materials, catalyst and oxidizing agent are simple and accessible, the reaction is simple to operate, and the yield is high, thereby being beneficial to industrial production.

The invention discloses a preparation method of Minodronic acid hydrate, which comprises the following steps: carrying out ketonic group protection on a compound (VII) to obtain a compound (VI), carrying out nucleophilic substitution reaction on the compound (VI) and 2-aminopyridine to obtain a compound (V), carrying out ketonic group deprotection on the compound (V), and carrying out cyclization reaction to obtain a compound (IV); and hydrolyzing the compound (IV) to obtain a compound (III), carrying out diphosphorylation on the compound (III) to obtain a compound (II), and recrystallizing the compound (II) to obtain the Minodronic acid hydrate (I). The synthetic route disclosed by the invention has the advantages of sufficient initial raw material sources, low cost, environment-friendly reagents used in the reaction process, safe industrial production, mild reaction conditions, fewer side reaction, simple after-treatment and no need of special or complex reaction equipment, is convenient to operate, and can easily implement industrial production.

The present invention provides substituted 2-aminopyridines useful in treating cell proliferative disorders. The novel compounds of the present invention are potent inhibitors of cyclin-dependent kinases 4 (cdk4).

The invention discloses a filgotinib synthetic method and belongs to the technical field of chemical synthesis of medicines. 6-chloro-2-aminopyridine and di-tert-butyl dicarbonate ester are subjected to condensation reaction to obtain 6-chloro-2-tert-butyloxycarbonyl aminopyridine; hydrolysis reaction is performed; the obtained 6-chloro-2-tert-butyloxycarbonyl aminopyridine and trifluorinated methyl sulfonic anhydride are subjected to trifluoromethanesulfonic acid esterification reaction; the obtained 2-tert-butyloxycarbonylamino-6-pyridyltrifluoromethanesulfonate and [(1,1-dioxo-4-thiomorpholinyl)methyl]benzo-4-boronic acid pinacol ester are subjected to condensation reaction to obtain a tert-butyl ester derivative; the tert-butyl ester derivative is treated by trifluoroacetic acid and subjected to de-protection; the obtained intermediate and ethoxycarbonyl isothiocyanate are subjected to isothiocyanate reaction; the obtained intermediate and hydroxylamine hydrochloride are subjected to ring closing reaction; the obtained intermediate and cyclopropane carbonyl chloride are subjected to amidation reaction to obtain the finished product. Operation is simplified; reagents are available; the concept of environment friendliness and environment protection is embodied.

The invention discloses an additive for wear resistance of lubricating oil, which comprises the following components in part by weight: 15 to 35 parts of antiwear agent, 6 to 29 parts of detergent dispersant and 12 to 26 parts of antioxidant preservative, wherein the antiwear agent consists of boric acid tributylester, phosphonic acid dibutyl ester, copper isooctoxyborate and cupric cyclohexoxylborate; the detergent dispersant consists of polybutene amine, polyisobutene carbamic acid ester and 2-aminopyridine; and the antioxidant preservative is boronized butanimide. The additive has wide use range, can be used in paraffin, naphthene and intermediate base oil, and also can be used in synthetic and semi-synthetic base oil. The additive has the advantages of effectively improving the wear resistance of the lubricating oil, strengthening the bearing capacity of the lubricating oil, making the lubricating oil have long service life, and having small dosage in the lubricating oil and simple and convenient preparation process.

The invention discloses a novel method for synthesizing imidazo[1,2-a]pyridine. According to the method, imidazo[1,2-a]pyridine is synthesized from 2-aminopyridine and chalcone through oxidization cyclization by taking 1,2-dichloroethane as a solvent and iodine as a catalyst. The method has the advantages that the operation is simple, the raw materials are easily available, reaction conditions are mild, the yield is relatively high, and the practicability is strong. The method is applicable to industrial production.

The invention provides an injectable hydrogel capable of releasing hydrogen sulfide, and a preparation method thereof. The preparation method comprises: oxidizing the hydroxyl group on sodium alginate(ALG) into an aldehyde group to obtain partially-oxidized sodium alginate (ADA), grafting 2-aminopyridine-5-thiocarboxamide (APTA) on the partially-oxidized sodium alginate by carrying out an amino reaction on the aldehyde group and the 2-aminopyridine-5-thiocarboxamide (APTA) to obtain an aldehyde group-containing macromolecular cross-linking agent partially-oxidized sodium alginate-2-aminopyridine-5-thiocarboxamide (ADA-APTA) capable of releasing hydrogen sulfide, and blending the ADA-APTA and gelatin to obtain the alginate-based injectable hydrogel capable of releasing hydrogen sulfide. According to the present invention, the preparation method is simple, the reaction condition is mild, the biocompatibility is good, and the hydrogen sulfide release amount of the gel can be adjusted bycontrolling the grafting ratio of 2-aminopyridine-5-thiocarboxamide.

The invention discloses a method for preparing a 1-hydroxy-2-(imidazo [1, 2-a] pyridine-3-radical) ethylidene-1,1-bisphosphonic acid compound with high purity, which comprises the following steps of: obtaining a compound as shown in a formula (III) through nucleophilic addition of a compound (trans-4-oxygroup-2-ethyl crotonate) as shown in a formula (II) and 2-aminopyridine; hydrolyzing the compound as shown in the formula (III) under alkali condition to obtain a compound as shown in a formula (IV); and phosphorylating the compound as shown in the formula (IV) by adopting toluene as a solvent to obtain a compound as shown in a formula (I). The synthetic process condition of the product is moderate, the aftertreatment is simple, the purity is high, the reaction cost is low, and the profit is high. The industrialized production can be realized easily.

The invention provides a method for preparation of 2-amino-5-chloro-pyridine and belongs to the technical field of fine organic synthesis. 2-amino-5-chloro-pyridine is prepared by adopting 2-aminopyridine as a raw material and using hydrochloric acid and sodium hypochlorite for an oxidative chlorination reaction. The method mainly includes the following steps: at 10 DEG C, slowly and dropwise adding a certain amount of concentrated hydrochloric acid in a mixed solution of 2-aminopyridine and NaClO, conducting a reaction at constant temperature for 2 hours, increasing the temperature to 25 DEG C for continuing the reaction for 4 hours, regulating the pH of a reaction product, extracting the reaction product with dichloroethane, and conducting separation to obtain 2-amino-5-chloro-pyridine. The yield of 2-amino-5-chloro-pyridine is up to 72%. The method has the advantages that the cheap NaClO solution generated by chlorination of tail gas by chlorine gas and hydrochloric acid are used as chlorinating agents, the cost is thus reduced, and the comprehensive utilization of resources is achieved; the reaction conditions are mild, direct use of chlorine gas is avoided, safety is high, and pollution is little.

A process for preparing 2-amino pyridine and its alkyl derivative from 2-cyanopyridine or its alkyl derivative includes incomplete hydrolysis and Hofmann degradation. Its advantage is high output rate (80%) and purity up to 99% or more.

A catalyst, useful for the hydroformylation of allyl alcohol, is described. The catalyst comprises a rhodium complex and a 6-bis(3,5-dialkylphenyl)phosphino-N-pivaloyl-2-aminopyridine or a 3-bis(3,5-dialkylphenyl)phosphino-2H-isoquinolin-1-one. The invention also includes a process for the production of 4-hydroxybutyraldehyde comprising reacting allyl alcohol with a mixture of carbon monoxide and hydrogen in the presence of a solvent and the catalyst. The process gives a high ratio of the linear product 4-hydroxybutyraldehyde to the branched co-product 3-hydroxy-2-methylpropionaldehyde.

The present invention relates to methods of treating cell proliferative disorders, such as cancer or Proteus syndrome, by utilizing 3-(3-(4-(1-aminocyclobutyl)phenyl)-5-phenyl-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine or 3-(3-(4-(1-aminocyclobutyl)phenyl)-5-(3-morpholinophenyl)-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine or N-(1-(3-(3-(4-(1-aminocyclobutyl)phenyl)-2-(2-aminopyridin-3-yl)-3H-imidazo[4,5-b]pyridin-5-yl)phenyl)piperidin-4-yl)-N-methylacetamide. The methods of the present invention can also relate to methods of treating cell proliferative disorders, such as cancer or Proteus syndrome, by utilizing the above compounds in combination with ((R)-6-(2-fluorophenyl)-N-(3-(2-((2-methoxyethyl)amino)ethyl)phenyl)-5,6-dihydrobenzo[h]quinazolin-2-amine).

The invention discloses an electrochemical synthetic method of a 3-bromine-2-phenyl-imidazo-[1,2-alpha] pyridine derivative. According to the method, a 2-bromoacetophenone compound and a 2-aminopyridine compound are added into DMSO containing an ammonium perchlorate electrolyte, a platinum sheet is served as the cathode, a platinum wire is served as an anode, stirring is performed at the room temperature, a constant-current reaction is performed, after the reaction is ended, reaction fluid is subjected to extraction, concentration and separation, and the 3-bromine-2-phenyl-imidazo-[1,2-alpha] pyridine derivative is obtained. Electricity is utilized to promote the reaction, an expensive metal catalyst is not needed, other oxidizing agents are not needed, heating is also not needed, the reaction can be performed at a mild room temperature, selectivity is good, and the whole process is simple and easy to perform and is consistent with the concept of green chemistry. An extra bromine source is not needed, extra oxidizing agents are also not needed, the electrochemical synthetic method is simple, efficient and wide in substrate application, and compounds with different substituent effect base groups can all achieve high yields.

A process for formation of N-aryl piperazines with chiral N′-1-[benzoyl(2-pyridyl)amino]-2-propane side-chains having the structure shown in formula below, and for making intermediate compounds therefor.

In this process, chirality is introduced at the piperazine ring formation step and 2-aminopyridyl substitution is incorporated via displacement. The resulting N, N′ disubstituted piperazines act on the central nervous system at 5HT receptors.