Two methoxycarbonylketen equivalents as dienophiles in the Diels–Alder reaction

Abstract
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.

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