Epoxidation of a series of polyoxygenated chalcones with H2O2 in the presence of poly(α-amino acid) catalysts, followed by Lewis acid-catalysed phenylmethanethiol ring-opening and cyclization, afforded trans- and cis-dihydroflavonols in moderate to high enantiomeric excess and yield.
H. van Rensburg, P. S. van Heerden, B. C. B. Bezuidenhoudt and D. Ferreira, Chem. Commun., 1996, 2747 DOI: 10.1039/CC9960002747
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