endo-Selectivity in the Diels–Alder reactions of non-conjugated olefins

Abstract
The addition of cyclopentene, cis-but-2-ene, and cycloheptene to 2-benzopyran-3-one (1) and its 1-methyl-derivative gives mainly endo-adducts (2), and the addition of cyclopentene to (5) gives mainly the cis-ester (7)via the endo-transition state.

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