Palladium/Copper Co-catalyzed Oxidative C-H/C-H Carbonylation of Diphenylamines: A Way To Access Acridones.

An efficient palladium/copper co-catalyzed oxidative double C(sp2)-H functionalization/carbonylation of diphenylamines for synthesis of acridones has been developed. This method utilizes readily available starting materials and mild reaction conditions. The protocol provides a simple, efficient, and atom-economic way to access acridones. Notably, the present protocol has excellent functional group tolerance and application value.