SCHEDULED MAINTENANCE
Cycloaddition of dimethyl acetylenedicarboxylate with a variety of 1-substituted 3-oxidopyridinium betaines yields novel furan cycloadducts. Methyl phenylpropiolate reacts similarly with the activated 1-[1′,2-di(p-nitrophenyl)vinyl]-3-oxidopyridinium betaine, but phenylacetylene adds to activated betaines to give azabicyclo[3.2.1]octene adducts.
C. Y. Ishag, K. J. Fisher, B. E. Ibrahim, G. M. Iskander and A. R. Katritzky, J. Chem. Soc., Perkin Trans. 1, 1988, 917 DOI: 10.1039/P19880000917
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