A metal‐free approach for the synthesis of seven‐membered N ‐heterocycles has been developed by the I 2 ‐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.
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An et al. (2021) studied this question.
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