Synthesis of 1-aminoindole derivatives via Rh( iii )-catalyzed annulation reactions of hydrazines with sulfoxonium ylides

Rhodium( iii )-catalyzed C–H functionalization followed by intramolecular annulation reactions between hydrazines and sulfoxonium ylides is described. This protocol leads to the efficient formation of 1-aminoindole derivatives with a broad substrate scope. A high level of chemoselectivity and functional group tolerance of this transformation were also observed.