Synthesis of heterocyclic-fused benzofurans via C-H functionalization of flavones and coumarinsElectronic supplementary information (ESI) available. See DOI: 10.1039/c3cc44456b

An efficient method to effect C-O cyclization was developed via the C-H functionalization of chromones and coumarins, affording heterocyclic-fused benzofurans. An efficient method to effect C-O cyclization was developed via the C-H functionalization of chromones and coumarins, affording heterocyclic-fused benzofurans.