I-Mediated [6 + 1] Annulation of Alkynes with MsONHOTf: Direct Synthesis of Benzo[]azepines.

The synthesis of benzo[]azepines using protonated aminating reagent (MsONHOTf) and alkynes through I-mediated [6 + 1] annulation reaction has been developed. This protocol features excellent functional group tolerance and mild reaction conditions and affords the benzo[]azepines in moderate to good yields under metal-free reaction conditions.