Chiral alkyl vinyl ethers 2b–2j underwent mild, inverse electron demand, Diels-Alder cycloadditions with 3-arenesulfonyl-2-pyrone 1 to form bridged bicyclic lactone adducts 3b–3j in excellent yields and with dia-stereoselectivities of up to 90%.
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Posner et al. (1986) studied this question.
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