Synthesis of 3-(phenylazo)-1, 2, 4-triazoles by a nucleophilic reaction of primary amines with 5-chloro-2, 3-diphenyltetrazolium salt via mesoionic 2, 3-diphenyltetrazolium-5-aminides

Abstract

The reactions of a 5-chloro-2, 3-diphenyltetrazolium salt with amines have been examined. In the presence of an inorganic base such as NaHCO3, primary and secondary amines undergo a nucleophilic substitution to give the corresponding 5-aminotetrazolium salts. When triethylamine is used as a base, primary amines give 3-phenylazo-1, 2, 4-triazoles. A plausible dual-path mechanism is proposed for the formation of the triazoles via Type B mesoionic tetrazolium-5-aminides. © 2009 Araki et al.