Methyl methoxypropiolate and methyl (phenylthio)propiolate give Diels–Alder adducts with 1,3-dienes; the adducts with cyclopentadienes give methyl 3-oxobicyclo[2.2.1] hept-5-ene-2-carboxylates on hydrolysis.
I. Gupta and P. Yates, J. Chem. Soc., Chem. Commun., 1982, 1227 DOI: 10.1039/C39820001227
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