Copper-Catalyzed Radical Sulfonylation of N-Propargylindoles with Concomitant 1,2-Aryl Migration

A novel copper-catalyzed cascade radical sulfonylation of N-propargyl-substituted indoles with concomitant 1,2-aryl migration was described. The protocol, which has good functional-group tolerance, provides practical, versatile and atom-economical method of accessing a new class of fascinating 2-sulfonated pyrrolo[1.2-alpha] indole derivatives in moderate to good yields through the formation of the new C-S, C-C and C=O bonds in a one-step.