Copper(II)-Catalyzed Synthesis of Pyrazinones from alpha-Azido-N-allylamides under an Oxygen Atmosphere

[摘要]：A copper(II)-catalyzed reaction of alpha-azido-N-allylamide synthetic under an oxygen atmosphere resulted in the formation of 2-formyl pyrazinones. The present transformation was characterized by the following steps: 1) 1,3-dipolar cycloaddition of the azido part onto the intramolecular alkene to give bicyclic aziridine intermediates; 2) further copper(II)-catalyzed oxygenation-oxidation of the aziridines to give 2-formyl pyrazinones.

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