A convenient method for the stereoselective synthesis of cis-β-substituted-α,β-epoxyketone is established employing Sn(OTf)2 mediated cross aldol reaction between α-bromoketone and aldehyde followed by successive treatment of the adduct with KF-dicyclohexyl-18-crown-6.
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Mukaiyama et al. (1982) studied this question.
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