Abstract
This paper presents an asymmetric Diels-Alder reaction with a diene bearing a chiral sulfinyl group. The Lewis acid-catalyzed intramolecular asymmetric hetero Diels-Alder reaction of a chiral α'-sulfinyl-α,β-unsaturated ketone derived from 3-methylcitronellal produced optically active 4a,5,6,7,8,8a-hexahydro-1H-2-benzopyran derivatives. On the basis of the stereochemical results obtained, a plausible mechanism for the asymmetric induction is presented
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