Iridium‐Catalyzed Oxidative Annulation of 2‐Arylindoles with Benzoquinone Leading to Indolo[1,2‐f]phenanthridin‐6‐ols

Abstract An iridium‐catalyzed oxidative [4+2] annulation reaction of 2‐arylindoles using quinone derivatives as C2 synthons has been developed. From this reaction, a series of diversely substituted indolo[1,2‐ f ]phenanthridine derivatives were synthesized in an efficient manner. Moreover, diverse transformations of the phenanthridine derivatives thus obtained have also been performed, which showcase the synthetic potential of the present protocol. magnified image