Sequential C-H Functionalization Reactions for the Enantioselective Synthesis of Highly Functionalized 2,3-Dihydrobenzofurans

The enantioselective synthesis of 2,3-dihydrobenzofurans was achieved by using two sequential C-H functionalization reactions, a rhodium-catalyzed enantioselective intermolecular C-H insertion followed by a palladium-catalyzed C-H activation/C-O cyclization. Further diversification of the 2,3-dihydrobenzofuran structures was possible by a subsequent palladium-catalyzed intermolecular Heck-type sp(2) C-H functionalization.