I2‐Promoted Intramolecular Oxidative Cyclization of Butenyl Anilines: A Facile Route to Benzo[b]azepines.

A metal‐free approach for the synthesis of seven‐membered N‐heterocycles has been developed by the I2‐promoted intramolecular cross‐coupling/annulation of butenyl anilines. This cyclization reaction involves C−H activation and C−C bond formation and exhibits good functional group tolerance. A series of benzo[b]azepine derivatives are obtained in moderate to good yields. [ABSTRACT FROM AUTHOR]