Hetero Diels–Alder reactions of α,β-unsaturated ketones (5) and (6) derived from carbohydrates with enol ethers (7) led to the formation of fused dihydropyrans with complete stereospecificity and creation of chiral centres on the newly formed template.
Y. Chapleur and M. Euvrard, J. Chem. Soc., Chem. Commun., 1987, 884 DOI: 10.1039/C39870000884
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