Copper-Catalyzed Direct Oxidative C–H Functionalization of Unactivated Cycloalkanes into Cycloalkyl Benzo[<i>b</i>]phosphole Oxides

The first simple and efficient Cu-catalyzed radical addition/cyclization of various unactivated cycloalkanes with diaryl­(arylethynyl)-phosphine oxides has been developed, providing a general, one-step approach to construct a new class of important benzo­[<i>b</i>]­phosphole oxides via sequential C–H functionalization along with two new C–C bond formations