Metal-free efficient synthesis of aryl sulfonamides from -hydroxy sulfonamide and amines.

A simple and novel approach has been developed for the synthesis of sulfonamides from -hydroxy sulfonamide. Notably, the iodine--butyl hydroperoxide (TBHP) system efficiently promoted the sulfonylation reactions of -hydroxy sulfonamides and amines the oxidative cleavage of an S-N bond. A variety of aryl sulfonamides were prepared in moderate to good yields using readily available starting materials and the biomass-derived 2-MeTHF solvent. The present method has the advantages of using metal-free reagents, an eco-friendly medium, cost-effective reagents, wide substrate scope, and mild conditions.