Heterodiene cycloadditions of 3-formyl chromone to ketene acetals derived from C2-symmetric 1,2-diarylethane-1,2-diols are diastereoselective; methanolysis of the cycloadducts derived from (S,S)-hydrobenzoin releases optically enriched methyl 3,4-dihydro-4-oxo-2H-1-benzopyran-2-ylacetate and the optically pure 1,2-diol.
T. W. Wallace, I. Wardell, K. Li and S. R. Challand, J. Chem. Soc., Chem. Commun., 1991, 1707 DOI: 10.1039/C39910001707
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