N‐Heterocyclic Carbene Catalyzed Switchable Reactions of Enals with Azoalkenes: Formal [4 + 3] and [4 + 1] Annulations for the Synthesis of 1,2‐Diazepines and Pyrazoles.
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Various 1,2-diazepine derivatives are synthesized by regio- and enantioselective formal [4 + 3] annulation reaction between enals and in situ formed azoalkenes.
[1] Frank Glorius,et al. N-heterocyclic carbene catalyzed switchable reactions of enals with azoalkenes: formal [4 + 3] and [4 + 1] annulations for the synthesis of 1,2-diazepines and pyrazoles. , 2014, Journal of the American Chemical Society.