Base-Promoted Synthesis of Triazenes via Formal Substitution of Arylazo Sulfones with Amines

A base-promoted formal substitution between arylazo sulfones and amines has been developed to generate disubstituted or trisubstituted triazenes. Compared with arylazo sulfones as aryl radical precursors, this application has a higher atom utilization. This strategy offers advantages over traditional methods: stable and easy-to-store raw materials, good air compatibility, no need for light-avoiding operations. The present discovery introduces a novel nonradical application for arylazo sulfones and presents an interesting new approach to classic triazene synthesis.