An asymmetric Diels–Alder reaction between ketene acetal 2 and the 3-nitropropenoate 10, derived from (–)-8-phenylmenthol, affords the optically pure adduct 15, which can be converted into either enantiomer of calicheamicinone 1.
D. L. J. Clive and N. Selvakumar, Chem. Commun., 1996, 2543 DOI: 10.1039/CC9960002543
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