Abstract

A chiral α-sulfinyl α,β-unsaturated ketone served as a chiral diene in intramolecular Lewis acid-catalyzed asymmetric cycloaddition reactions, giving hetero-Diels-Alder reaction products along in some cases with ene reaction products in high optical yields. The reaction pathways for Diels-Alder or ene reactions were readily controlled depending on the Lewis acids used.

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