Palladium(0)-catalysed reactions of 4-chloroacetoxyalk-2-enoic esters with amines selectively give 4-aminoalk-2-enoic esters, which are readily converted into pyrrol-2(5H)-ones (4-but-2-enelactams).
R. Tanikaga, J. Takeuchi, M. Takyu and A. Kaji, J. Chem. Soc., Chem. Commun., 1987, 386 DOI: 10.1039/C39870000386
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