A SYNTHESIS OF SOME NOVEL 4,5‐DIHYDROAZEPINES BY THE REACTION OF OXAZOLIUM 5‐OXIDES WITH 1,2‐DICYANOCYCLOBUTENE

Heating primary or secondary α-amino acids in acetic anhydride in the presence of 1,2-dicyanocyclobutene leads to 4,5-dihydroazepines via the intermediacy of mesoionic oxazolium 5-oxides.

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