2,2-Disubstituted 2,3-dihydropyran-4-ones may be prepared in high yields by the Lewis acid-catalysed hetero-Diels–Alder reactions of electron-rich dienes with ketones bearing strongly electron-withdrawing substituents.
P. C. B. Page, P. H. Williams, E. W. Collington and H. Finch, J. Chem. Soc., Chem. Commun., 1987, 756 DOI: 10.1039/C39870000756
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