Ammonia → N-[1-(2-aminopropyl)-4-piperidinyl]-1-[(4-fluorophenyl)methyl]-1H-benzimidazol-2-amine

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A mixture of 4 parts of 1-[4-[[1-[(4-fluorophenyl)methyl]-1H-benzimidazol-2-yl]amino]-1-piperidinyl]-2-propanone, oxime and 120 parts of methanol, saturated with ammonia, was hydrogenated at normal pressure and at room temperature with 2 parts of Raney-nickel catalyst. After the calculated amount of hydrogen was taken up, the catalyst was filtered off and the filtrate was evaporated. The residue was crystallized from acetonitrile, yielding 1.3 parts (34%) of N-[1-(2-aminopropyl)-4-piperidinyl]-1-[(4-fluorophenyl)methyl]-1H-benzimidazol-2-amine, mp. 178.3° C. (intermediate 132).

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