Rhodium(III)-catalyzed intramolecular amidoarylation and hydroarylation of alkyne via C–H activation: switchable synthesis of 3,4-fused tricyclic indoles and chromans

The controllable intramolecular amidoarylation and hydroarylation of alkynes has been achieved via rhodium(III)-catalyzed C–H activation. The merger of two distinct reaction pathways allows for the development of atom- and step-economic protocols for the switchable synthesis of 3,4-fused indoles and chromans, respectively.