反应详情

2β-Carbomethoxy-3β-hydroxytropane (304 mg, 1.43 mmol) was dissolved in 4 mL of dry DMF. Imidazole (208 mg, 3.01 mmol) and tert-butyldimethylsilyl chloride (345 mg, 2.29 mmol) were added, and the reaction mixture was stirred overnight. Water was then added, and the mixture was extracted with ether. The combined organic layers were washed with water and brine and dried over MgSO4. The solvent was evaporated in vacuo, and the residue was chromatographed on silica gel half-saturated with ammonia using ethyl acetate as eluent to give 265 mg of the title compound (55% yield): IR (thin film) 2951, 2897, 2857, 1790, 1716, 1497, 1271, 1144, 1107, 837 cm-1 ; 1H NMR (CDCl3, 300 MHz) δ 3.91 (dt, 1H, J=11.1, 6.1 Hz), 3.67 (s, 3H), 3.45-3.35 (m, 1H), 3.25-3.17 (m,1H), 2.75-2.68 (m,1H), 2.18 (s, 3H), 2.35- 1.42 (m, 6H), 0.84 (s, 9H), 0.02 (s, 3H), 0.01 (s, 3H); 13C NMR (CDCl3, 75.46 MHz) δ 171.4, 64.6, 64.4, 61.6, 54.0, 51.1, 41.2, 39.5, 28.2, 25.8, 25.2, 18.1, 6.6, 6.3; mass spectrum m/z 313 (M+), 256, 242, 182, 97, 82; HRMS (FAB) calcd for C16H32NO3Si (MH ) 314.2143, found 314.2145.

1. extractionthe mixture was extracted with ether
2. washThe combined organic layers were washed with water and brine
3. dry with materialdried over MgSO4
4. customThe solvent was evaporated in vacuo
5. customthe residue was chromatographed on silica gel half-saturated with ammonia