Hydrochloric Acid → 1-{3-[4-(diphenylmethyl)piperazinyl]propyl}-1H-benzimidazol-2-amine

Participants

Reaction Steps

A mixture of 12 parts of methyl [1-{3-[4-(diphenylmethyl)-1-piperazinyl]propyl}-1H-benzimidazol-2-yl]carbamate, 60 parts of a concentrated hydrochloric acid solution and 80 parts of ethanol is stirred and refluxed overnight. The reaction mixture is evaporated and water is added to the residue. The free base is liberated in the conventional manner with ammonium hydroxide and extracted with trichloromethane. The extract is dried, filtered and evaporated. The residue is crystallized from ethanol. The product is filtered off and dried, yielding 1-{3-[4-(diphenylmethyl)-1-piperazinyl]propyl}-1H-benzimidazol-2-amine; mp. 228.7° C.

Provenance & Evidence