反应详情

温度

-78 °C

To a −78° C. solution of benzyl 2-hydroxypropanoate (250 mg, 1.39 mmol) and 4A molecular sieves in 2 mL CH2Cl2 was added trifluoromethanesulfonic anhydride (0.33 mL, 1.97 mmol). After stirring for 10 min at this temperature, 2,6-lutidine (0.31 mL, 2.62 mmol) was added. After 15 min, diisopropylethylamine (0.46 mL, 2.62 mmol) was added and after another 15 min, a solution of 1-((1R,5S)-8-{2-[4-(3-fluorophenyl)piperidin-4-yl]ethyl}-8-azabicyclo[3.2.1]oct-3-yl)-2-methyl-1H-benzimidazole dihydrochloride (400 mg, 0.66 mmol) in 3 mL CH2Cl2 was added. The reaction mixture was stirred at −78° C., then allowed to warm to room temperature overnight, washed with saturated aqueous NaHCO3, and purified by chromatography (3% (2M NH3/MeOH) in CHCl3) to provide benzyl 2-(4-(3-fluorophenyl)-4-{2-[(1R,5S)-3-(2-methyl-1H-benzimidazol-1-yl)-8-azabicyclo[3.2.1]oct-8-yl]ethyl}piperidin-1-yl)propanoate (146 mg, 37%) as a solid. 1H NMR (400 MHz, CDCl3), δ 7.68 (m, 1H), 7.37-7.26 (m, 7H), 7.22-7.13 (m, 2H), 7.08 (m, 1H), 6.98 (m, 1H), 6.92 (m, 1H), 5.09 (s, 2H), 4.62 (m, 1H), 3.39-3.17 (m, 2H), 2.89-1.26 (m, 27H); ESI-MS 609 (M+H).

1. additionwas added
2. temperatureto warm to room temperature overnight
3. washwashed with saturated aqueous NaHCO3
4. custompurified by chromatography (3% (2M NH3/MeOH) in CHCl3)