The reaction of 2-chlorobenzimidazole (I) with N,N'-dimethylprolylene-1,3-diamine (II) by heating at 130 C gives N-(1H-benzimidazol-2-yl)-N,N'-dimethylpropylene-1,3-diamine (III), which is treated with tert-butoxycarbonyl anhydride yielding the carbamate (IV). The condensation of (IV) with 4-fluorobenzyl chloride (V) by means of K2CO3 in DMF affords N-(benzyloxycarbonyl)-N'-[1-(4-fluorobenzyl)benzimidazol-2-yl)-N,N'-dimethylpropylene-1,3-diamine (VI), which is deprotected with trifluoroacetic acid providing the secondary amine (VII). Finally, this compound is condensed with phenyl N-[3,5-bis(trifluoromethyl)benzyl]carbamate (VIII) by heating at 120 C.