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In the presence of a chiral promoter consisted of chiral diamine coordinated tin(II) triflate and tributyltin fluoride, silyl enol ether of S-ethyl ethanethioate reacts with α-ketoesters to afford the corresponding aldol-type adducts, 2-substituted malates, in good yields with excellent enantiomeric excesses.
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Kobayashi et al. (1989) studied this question.
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