A new ring expansion reaction of 1-acyl-2-vinylpiperidines and 1-acyl -2-vinylpiperazines has been achieved. Amide enolate induced aza-Claisen rearrangements of 1-acyl-2-azacycles provide the corresponding lactams possessing various substituents at α-position of carbonyl in good yields.
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Suh et al. (1996) studied this question.
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