4-Vinyl- and 4-allyl-azetidin-2-ones (1) and (2) have been converted into the imines (5) and (19) respectively, while use of azetidin-2-ones in which the double bond was substituted with a methoxycarbonyl group allowed the synthesis of the enamines (13) and (21).
C. L. Branch and M. J. Pearson, J. Chem. Soc., Chem. Commun., 1981, 946 DOI: 10.1039/C39810000946
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