Pyridinium methylides combine with hex-3-yne-2,5-dione, but-3-yn-2-one, methyl but-2-ynoate, methyl phenyl-acetylenecarboxylate, dimethyl penta-2,3-dienedioate, and ethyl 2-methylbuta-2,3-dienoate and 2-methylpenta-2,3-dienoate to give indolizines, identified from spectra.
R. M. Acheson, M. G. Bite and M. W. Cooper, J. Chem. Soc., Perkin Trans. 1, 1976, 1908 DOI: 10.1039/P19760001908
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