反应详情

3,4-Dichlorophenyl chloroformate (282 mg) in dichloromethane (10 ml) was added to a solution of 1-[(1-methylpiperidin-3-yl)methyl]piperazine (246 mg) in dichloromethane (2 ml) at room temperature. N,N-Diisopropylethylamine (0.44 ml) was added and the mixture stirred for 18 hours. Saturated aqueous sodium bicarbonate solution (5 ml) was added and the dichloromethane layer separated then concentrated in vacuo onto silica gel (0.5 g). The resulting powder was subjected to chromatography on silica gel (20 g) using a gradient of 100% dichloromethane through to 20% methanolic ammonia in dichloromethane to give the title compound (292 mg).

1. customthe dichloromethane layer separated
2. concentrationthen concentrated in vacuo onto silica gel (0.5 g)