反应详情

5.00 g (contaminated) of rac.-N-benzyloxycarbonyl-1-(5-chloro-1H-benzimidazol-2-yl)ethylamine is dissolved in a mixture of 100 mL of methanol and 40 mL methylene chloride, combined with 1.0 g palladium on charcoal, and hydrogenated for 1 hour at 3.4 bar hydrogen pressure. The solvents are distilled off and the crude product is purified by chromatography with silica gel (eluent: methylene chloride/ethanol=95:5+0.2% ammonia). Yield: 1.08 g (25% over 3 steps); Rf value: 0.37 (silica gel; dichloromethane/ethanol=4:1+2% ammonia); C9H10ClN3 (195.65); mass spectrum: (M+H)+=196/198 (chlorine isotope).

1. distillationThe solvents are distilled off
2. customthe crude product is purified by chromatography with silica gel (eluent: methylene chloride/ethanol=95:5+0.2% ammonia)