Copper-Catalyzed Aerobic Spirocyclization of Biaryl-N-H-imines via 1,4-Aminooxygenation of Benzene Rings

A synthetic method of azaspirocyclohexadienones has been developed through copper-catalyzed aerobic spirocyclization of biaryl-N-H-imines prepared by the reaction of biarylcarbonitriles and Grignard reagents.