反应详情

A mixture of 4.3 g of N-benzyl 3-aminopiperidine (22.6 mmol) and 3-cyanophenyl isocyanate (3.58 g, 24.9 mmol) in dimethylformamide (100 mL) was stirred at ambient temperature for 18 h. The reaction was diluted with water (500 mL) and extracted with ethyl acetate (3×150 mL). The organic solution was washed with water (5×100 mL), dried and evaporated. This material was purified further by flash chromatography on silica gel using a gradient of 1:1 to 3:1 ethyl acetate:hexane. There was obtained 3.18 g of the pure urea (9.52 mmol); LRMS (M+H)+ m/z=335.

1. extractionextracted with ethyl acetate (3×150 mL)
2. washThe organic solution was washed with water (5×100 mL)
3. customdried
4. customevaporated
5. customThis material was purified further by flash chromatography on silica gel using a gradient of 1:1 to 3:1 ethyl acetate