Cu(II)-Catalyzed Ortho C(sp2)–H Diarylamination of Arylamines To Synthesize Triarylamines

A copper-catalyzed, directed ortho C–H diarylamination of indoles, indolines, anilines, and N-aryl-7-azaindoles has been established. Only copper salt as the catalyst and oxygen as the terminal oxidant are used to synthesize triarylamines using various diarylamines including carbazole and phenothiazine. Mechanistic interrogation reveals that copper plays a dual role.