Hydrogen Bromide → N-[1-(4-fluorophenylmethyl)-1H-benzimidazol-2-yl][1,4'-bipiperidine]-4-amine

Participants

Reaction Steps

A mixture of 21 parts of ethyl 4-[1-(4-fluorophenylmethyl)-1H-benzimidazol-2-ylamino][1,4'-bipiperidine]-1'-carboxylate and 450 parts of hydrobromic acid solution 48% was stirred and refluxed for 16 hours. The reaction mixture was evaporated. From the residue the free base was liberated in the conventional manner with sodium hydroxide in water and extracted with dichloromethane. The extract was dried, filtered and evaporated, yielding 8 parts (50%) of N-[1-(4-fluorophenylmethyl)-1H-benzimidazol-2-yl][1,4'-bipiperidine]-4-amine as a residue (intermediate 71).

Provenance & Evidence