3-Methoxy-1-phenylthio-1-propene as d1/ d3Synthon: Application for an Asymmetric Synthesis of (S)-(+)-Parasorbic Acid

Abstract
Regioselective ring-opening of oxiranes with the sulfurstabilized anion 1 of 3-methoxy-1-phenylthio-1-propene and acidcatalyzed cyclization of the resulting bishomoallyl alcohols 2a-f leading to the tetrahydropyrans 3a-f are key-steps in the synthesis of α,β-unsaturated δ-lactones. An enantioselective synthesis of (S)-(+)-parasorbic acid (14) has been developed starting from (S)-(-)-epoxypropane (9).

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