反应详情

To a stirred solution of 4-Benzo[1,3]dioxol-4-yl-piperidine (0.680 g, 3.31 mmol,) in dichloromethane (35 ml) and methanol (1 ml) was added at room temperature commercially available trans-tert-butyl-4-(2-oxoethyl)-cyclohexylcarbamate (1.04 g, 4.31 mmol) and the solution was allowed to stir for 120 min. Sodium triacetoxyboron hydride (1.26 g, 5.96 mmol) was added portion wise and the mixture was allowed to stir for 16 h at room temperature. The solution was poured into saturated sodium bicarbonate solution (15 ml) and extracted with dichloromethane (2×20 ml). The combined organic layers were dried (MgSO4) and evaporated. The crude material was purified by flash chromatography on silica gel The crude material was purified by flash chromatography (methanol in dichloromethane 0-10%) to yield trans-{4-[2-(4-Benzo[1,3]dioxol-4-yl-piperidin-1-yl)-ethyl]-cyclohexyl}-carbamic acid tert-butyl ester as a white solid (1.43 g, 74%), MS (ISP) m/z=431.5 [(M+H)+].

1. stirringto stir for 16 h at room temperature
2. extractionextracted with dichloromethane (2×20 ml)
3. dry with materialThe combined organic layers were dried (MgSO4)
4. customevaporated
5. customThe crude material was purified by flash chromatography on silica gel The crude material
6. customwas purified by flash chromatography (methanol in dichloromethane 0-10%)