The Diels–Alder reaction of chiral 2-(3-tolyl p-sulfinyl)furyl α,β-unsaturated ketones 3 and 4 with cyclopentadiene in the presence of a Lewis acid proceeds smoothly to give the corresponding endo adducts 5a and 6a, respectively, in excellent yield with high diastereoselectivity.
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Arai et al. (1996) studied this question.