Visible-Light-Induced C (sp3)-H Functionalization of Tosylhydrazones: Synthesis of Polysubstituted Pyrroles under Metal-Free Conditions.

Iodine catalyzed C (sp3)-H functionalization of tosylhydrazones with ß-enamino esters under visible light irradiation for the synthesis of trisubstituted pyrroles has been described. The present method is also applicable to α- substituted tosylhydrazones to yield the tetra-substituted pyrroles.