A Metal- and Azide-Free Multicomponent Assembly toward Regioselective Construction of 1,5-Disubstituted 1,2,3-Triazoles

The construction of 1,5-disubstituted 1,2,3-triazoles has been effected through the cascade dual C-N bond formation, N-N bond formation and an acyl migration-based C-C bond formation via the three-component reactions of enaminones, tosylhydrazine and primary amines. This metal- and azide-free, regioselective synthetic method proceeds in the presence of only molecular iodine.