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- W2014604908 abstract "Saccharomyces cerevisiae (baker's yeast) reduces ethyl 4-chloro-acetoacetate enantioselectively to ( R )- or ( S )-ethyl 4-chloro-3-hydroxybutyrate depending on the reaction conditions and the physiological state of the yeast cells. The ( S )-enantiomer is obtained under batch conditions with resting cells (55%, enantiomeric excess [ee]), and 4-chloro-acetate fed-batch actively metabolising yeast affords the ( R )-isomer (54%, ee). The enantioselective reduction of the substrate is accompanied by competing enzyme actions. Of the metabolites formed from the substrate, chloroacetone and the target compound ( R )-ethyl 4-chloro-3-hydroxybutyrate emerged as most important effectors of enantioselectivity of the microbial reduction. As a minor side-reaction, an aerobic reductive dehalogenation of the substrate was observed. The unusual high enantiopurity of the dehalo-product ( S )-ethyl 3-hydroxybutyrate confirms the stereodirecting effect of chloroacetone impressively. Hence, with S. cerevisiae either enantiomer can be obtained by variation of reaction conditions. The yeast further turned out to be a promising biocatalyst for dehalogenations." @default.
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- W2014604908 date "2002-01-01" @default.
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- W2014604908 title "How Cell Physiology Affects Enantioselectivity of the Biotransformation of Ethyl 4-chloro-acetoacetate with Saccharomyces cerevisiae" @default.
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- W2014604908 doi "https://doi.org/10.1080/1024242021000032502" @default.
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