Ethanol → HCID 12891722, compound

Participants

Reaction Steps

To 1 part of a solution of 2 parts of thiophene in 40 parts of ethanol are added 3.3 parts of 1-(4-fluorophenylmethyl)-N-{1-[2-(4-nitrophenyl)ethyl]-4-piperidinyl}-1H-benzimidazol-2-amine and 120 parts of methanol. The whole is hydrogenated at normal pressure and at room temperature with 2 parts of platinum-on-charcoal catalyst 5%. After the calculated amount of hydrogen is taken up, the catalyst is filtered off and the filtrate is evaporated. The residue is purified by column-chromatography over silica gel using a mixture of methylbenzene and methanol (95:5 by volume) saturated with ammonia, as eluent. The pure fractions are collected and the eluent is evaporated. The residue is crystallized from 2-propanol, yielding 1.3 parts (42%) of N-{1-[2-(4-aminophenyl)ethyl]-4-piperidinyl}-1-(4-fluorophenylmethyl)-1H-benzimidazol-2-amine; mp. 195.4° C.

Provenance & Evidence