Cl.Cl.[NH2:3][C@H:4]1[CH:9]2[CH2:10][CH2:11][N:6]([CH2:7][CH2:8]2)[CH2:5]1.[H-].[Na+].O=[CH:15][CH2:16][N:17]1[C:21]2[C:22]([C:26]([O:28][CH3:29])=[O:27])=[CH:23][CH:24]=[CH:25][C:20]=2[N:19]=[CH:18]1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>C(Cl)Cl.C(O)(=O)C>[N:6]12[CH2:11][CH2:10][CH:9]([CH2:8][CH2:7]1)[C@H:4]([NH:3][CH2:15][CH2:16][N:17]1[C:21]3[C:22]([C:26]([O:28][CH3:29])=[O:27])=[CH:23][CH:24]=[CH:25][C:20]=3[N:19]=[CH:18]1)[CH2:5]2To a stirred solution of (S)-(−)-3-aminoquinuclidine dihydrochloride (0.2 g, 0.8 mmol) in methylene chloride (2 mL) was added sodium hydride (0.1 g, 1.6 mmol) and the mixture was stirred for 2 h. A solution of methyl 1-(2-oxoethyl)-1H-benzo[d]imidazole-7-carboxylate (0.2 g, 0.7 mmol) from Step E above in methylene chloride (3 mL) was added followed by acetic acid (0.7 mL) and the mixture was stirred at room temperature for 4 h. Sodium triacetoxyborohydride (0.4 g, 2.1 mmol) was then added in portions and the reaction was stirred at room temperature overnight. The crude reaction was quenched with methanol, concentrated under reduced pressure, and purified by preparative thin layer chromatography (90:9:1 methylene chloride/methanol/ammonium hydroxide) to afford (S)-methyl 1-(2-(quinuclidin-3-ylamino)ethyl)-1H-benzo[d]imidazole-7-carboxylate (0.2 g, quantitative yield): MS (ESI+) m/z 329 (M+H).
読み込み中…
