Poly-L-leucine catalyses the asymmetric epoxidation of enones 1–6 efficiently in a non-aqueous medium to provide the epoxy ketones 7–12 (70–91% yield; 80 to 95% ee). The strategy was used to make diltiazem 16 and the TaxolTM side chain 23 in single enantiomer form.
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Journal of the Chemical Society, Perkin Transactions 1
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