New method for studying the reactivities of α-diazo imines. Investigation of the cyclization of N-substituted 2-diazoacetamidines to 1,2,3-triazoles

N-Substituted diazoacetamidines were generated in the reaction of N-substituted acetamidines with benzenesulfonyl azide. It is shown that their cyclization to isomeric 1,2,3-triazoles characterizes the reactivities of α-diazo imines. The synthesis of 5-amino-1,2,3-triazole derivatives was accomplished, and their 1H, 13C, and 15N NMR spectra were studied.