A Michael reaction occurs between 2-pyridone and dimethyl acetylenedicarboxylate, but 1-methyl-2-pyridone and the ester appear to give a Diels–Alder adduct which decomposes to N-methylphthalimide.
R. M. Acheson and P. A. Tasker, J. Chem. Soc. C, 1967, 1542 DOI: 10.1039/J39670001542
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