Reaction of Meldrum's acid with the imidazole- and pyrazole-carbaldehydes (9)–(11) gave the condensation products (6), (7a), and (8) which were pyrolysed in the gas phase to give the title azaanalogues (2)–(4) of pyrrolizin-3-one (1), as air-sensitive yellow solids.
H. McNab, J. Chem. Soc., Perkin Trans. 1, 1987, 653 DOI: 10.1039/P19870000653
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