The presence of zinc chloride in the reduction of chiral β-ketosulphoxides with di-isobutylaluminium hydride effects high 1,3-asymmetric induction to give β-hydroxysulphoxides; this method can be successfully applied to the synthesis of optically pure 1,4- or 1,5-lactones.
H. Kosugi, H. Konta and H. Uda, J. Chem. Soc., Chem. Commun., 1985, 211 DOI: 10.1039/C39850000211
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