The asymmetic synthesis of 7-oxabicyclo[2.2.1]hept-5-ene-2-carboxylate derivatives was accomplished by the highly diastereoselective Diels–Alder reaction of (S)s- and (R)s-3-(2-pyridylsulphinyl)acrylates with furan.
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Takayama et al. (1986) studied this question.