Vinylsulfonyl Chloride, a Ketene Equivalent for the Intramolecular Diels-Alder Reaction

Abstract
A completely regioselective and highly diastereoselective formal [4+2]-cycloaddition of ketene to 1,3-dienes bearing hydroxylated side chains is achieved by intramolecular Diels-Alder reaction of their vinylsulfonates followed by oxidative desulfurization.

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