Annulation Reactions of Donor–Acceptor Cyclopropanes with (1-Azidovinyl)benzene and 3‑Phenyl‑2H‑azirine

Under the influence of heat and Lewis acid, donor/acceptor cyclopropanes underwent annulation reactions with (1-azidovinyl)­benzene and 3-phenyl-2H-azirine to form an unusual azabicyclic scaffold with an imbedded aziridine. The mechanism of reaction is believed to proceed via a vinyl nitrene intermediate.