Synthesis of Stable 1H-Azirines Reinvestigated: A Structural Corrigendum

[摘要]：The isoquinoline-catalyzed synthesis of pretended 1H-azirines from phenacyl bromides and N,N'-dialkylcarbodiimides was repeated. The products do not possess the structure of antiaromatic 1H-azirines, but simple N-acyl-N,N'-dialkylureas were formed instead. This structural corrigendum was confirmed by the independent synthesis of the known ureas and comparison of their H-1 NMR and C-13 NMR spectroscopic data in the case of six compounds. Thus, 1H-azirines keep their classification as very short-lived intermediates.

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