The enantioselective reduction of tibolone into the corresponding 3 alpha-hydroxy or 3 beta-hydroxy metabolite can be controlled by choosing suited strains of yeasts and biotransformation conditions. A restricted screening performed among 52 yeasts showed that the 3 alpha-epimer was preferentially obtained with high epimeric purity with various strains (i.e. with Kluyveromyces lactis CBS 2359), while only Saccharomyces cerevisiae CBS 3093 gave the 3 beta-epimer as major product. The reduction of tibolone with K. lactis CBS 2359 and S. cerevisiae CBS 3093 was optimised. S. cerevisiae CBS 3093 furnished a 96:4 ratio of 3 beta/3 alpha with complete molar conversion within 72 h when the initial concentration of substrate was below 2.5 g/L. K. lactis CBS 2359 gave a 99:1 ratio of 3 alpha/3 beta with complete conversion in 64 h. (C) 2007 Elsevier Inc. All rights reserved.
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Chinese Acad Sci, Chengdu Inst Organ Chem, Asymmetr Synth & Chiraltechnol Key Lab Sichuan Pr, Chengdu, Peoples R China
Univ Chinese Acad Sci, Beijing, Peoples R ChinaXihua Univ, Dept Chem, Chengdu, Peoples R China
Zhang, Jiayan
Liu, Min
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Univ Chinese Acad Sci, Beijing, Peoples R ChinaXihua Univ, Dept Chem, Chengdu, Peoples R China
Liu, Min
Huang, Min
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Huang, Min
Liu, Hui
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