反应详情

A mixture of 21.5 parts of 1-[3-{4-[(4-chloro-2-nitrophenyl)-amino]-1-piperidinyl}propyl]-1,3-dihydro-2H-benzimidazol-2-one and 240 parts of methanol is hydrogenated at normal pressure and at room temperature with 5 parts of Raney-nickel catalyst. After the calculated amount of hydrogen is taken up, the catalyst is filtered off and the filtrate is evaporated, yielding 20 parts (100%) of 1-[3-{4-[(2-amino-4-chlorophenyl)amino]-1-piperidinyl}propyl]-1,3-dihydro-2H-benzimidazol-2-one as a residue.

1. filtrationthe catalyst is filtered off
2. customthe filtrate is evaporated