Linear N-benzyl-N′-trityl-α,Ï-diamines and N α, N Ï-ditritylpolyamines were efficiently converted into the corresponding N-(1-benzyltetrazol-5-yl)-substituted derivatives upon treatment with benzyl isothiocyanate followed by reaction of the thus-obtained thioureas with azidotrimethylsilane under Mitsunobu reaction conditions.