8-azabicyclo[3.2.1]octane-8-carboxamide derivative
A technology of cycloalkyl and A-1, which is applied in the field of pharmaceutical compositions, and can solve problems such as having different structures and not having 8-azabicycles
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[1126]The present invention is illustrated in more detail by the following Reference Examples, Examples and Experiments, but it is not intended that the present invention be limited thereto. In addition, the compound nomenclature used in the following Reference Examples and Examples is not necessarily based on IUPAC nomenclature.
[1127] The following abbreviations are used in the Examples and Reference Examples.
[1128] THF: Tetrahydrofuran
[1129] NaBH(OAc) 3 : Sodium Triacetoxyborohydride
[1130] (Boc) 2 O: di-tert-butyl dicarbonate
[1131] DMF: N,N-Dimethylformamide
[1132] DIAD: Diisopropyl azodicarboxylate
[1133] Me: methyl
[1134] Et: ethyl
[1135] Bu: butyl
[1136] Ph: phenyl
[1137] Bn: benzyl
[1138] Ms: Methanesulfonyl
[1139] Ac: Acetyl
[1140] Boc: tert-butoxycarbonyl
[1141] Cbz or Z: benzyloxycarbonyl
[1142] Tf: Trifluoromethanesulfonyl
[1143] N: equivalent (for example, 2N HCl refers to 2 equivalents of hydrochloric acid)
...
Embodiment 2
[1208] (3-endo)-3-(Benzyloxy)-8-azabicyclo[3.2.1]octane-8-carboxylate tert-butyl
[1209]
[1210] Step (i):
[1211] Compound I (4.23 g) was dissolved in DMF (100 ml), and benzyl bromide (3.32 ml) and sodium hydride (1.62 g) were added thereto, and the mixture was stirred at room temperature overnight. Water was added to the reaction mixture, and the mixture was extracted with diisopropyl ether. The organic layer was dried over sodium sulfate, then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: hexane / ethyl acetate=3 / 1) to obtain the title compound II (4.98 g).
[1212]
Embodiment 3
[1214] (3-endo)-3-phenoxy-8-azabicyclo[3.2.1]octane-8-carboxylate tert-butyl
[1215]
[1216] Step (i):
[1217] Compound I (490.6 mg) was dissolved in THF (4 mL), and then DIAD (0.66 ml), triphenylphosphine (869 mg) and phenol (312 mg) were added thereto, and the mixture was stirred at room temperature overnight. The reaction mixture was concentrated under reduced pressure, and the residue was diluted with ethyl acetate and washed with 1N aqueous sodium hydroxide solution and brine. The organic layer was dried over sodium sulfate, then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: hexane / ethyl acetate=9 / 1) to give the title compound II (451 mg).
[1218]
[1219] Reference Example 4:
[1220] (3-endo)-3-(Benzenesulfonyl)-8-azabicyclo[3.2.1]octane-8-carboxylate tert-butyl
[1221]
[1222] Step (i):
[1223] Compound I (13.4 g) was dissolved in dichloromethane (600 ml), and then methanesulfonyl chlorid...
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