Rhodium/Copper-Catalyzed Annulation of Benzimides with Internal Alkynes: Indenone Synthesis through Sequential C-H and C-N Cleavage

B.-J. Li, H.-Y. Wang, Q.-L. Zhu; Z.-J. Shi* Angew. Chem. Int. Ed. 2012, 51, 3948–3952.