Asymmetric ketone reduction by a hyperthermophilic alcohol dehydrogenase. The substrate specificity, enantioselectivity and tolerance of organic solvents
作者:Dunming Zhu、Hiba T. Malik、Ling Hua
DOI:10.1016/j.tetasy.2006.10.042
日期:2006.11
asymmetric ketone reduction, the substrate specificity and enantioselectivity of an alcohol dehydrogenase from the hyperthermophilic archaeon Pyrococcus furiosus have been evaluated. This hyperthermophilic alcohol dehydrogenase catalyzes the reduction of various ketones including aryl ketones, α- and β-ketoesters. Interestingly, aryl ketones, phenyl-substituted α- and β-ketoesters were reduced to the
Stereoselective Enzymatic Synthesis of Chiral Alcohols with the Use of a Carbonyl Reductase from <i>Candida </i><i>m</i><i>agnoliae</i> with Anti-Prelog Enantioselectivity
作者:Dunming Zhu、Yan Yang、Ling Hua
DOI:10.1021/jo0603328
日期:2006.5.1
carbonyl reductases with anti-Prelog enantioselectivity, the activity and enantioselectivity of a carbonyl reductase from Candida magnoliae have been examined with various ketones of diverse structures. This carbonyl reductasecatalyzed the reduction of a series of ketones, α- and β-ketoesters, to anti-Prelog configurated alcohols in excellent optical purity. The usefulness of this carbonyl reductase has
Highly Enantioselective Hydrogenation of α-Keto Esters Catalyzed by Ru-Tunephos Complexes
作者:Xumu Zhang、Chun-Jiang Wang、Xianfeng Sun
DOI:10.1055/s-2006-932461
日期:——
Various enantiomerically pure α-hydroxy esters were synthesized by asymmetric hydrogenation of α-keto esters catalyzed by Ru-C n -Tunephos complex. Up to 97.1% ee has been achieved for both α-aryl and α-alkyl substituted α-keto esters.
通过由Ru-C n -Tunephos 配合物催化的α-酮酯的不对称氢化合成了各种对映体纯α-羟基酯。α-芳基和 α-烷基取代的 α-酮酯的 ee 高达 97.1%。
New Chiral Diphosphine Ligands Designed to have a Narrow Dihedral Angle in the Biaryl Backbone
Enzymatic enantioselective reduction of α-ketoesters by a thermostable 7α-hydroxysteroid dehydrogenase from Bacteroides fragilis
作者:Dunming Zhu、Jennifer Elisabeth Stearns、Monica Ramirez、Ling Hua
DOI:10.1016/j.tet.2006.02.041
日期:2006.5
A thermostable 7 alpha-hydroxysteroid dehydrogenase (7-HSDH) from Bacteroides fragilis ATCC 25285 was cloned and over-expressed in E. coli, and its substrate specificity and stereoselectivity toward reduction of various ketones were examined. This alcohol dehydrogenase was active toward a series of aromatic and bulky aliphatic alpha-ketoesters. The substituents at the phenyl ring of aromatic alpha-ketoesters greatly affected the activity, but their effects oil enantioselectivity were minimal. The synthetic application of this enzyme was then demonstrated through the preparation of a few alpha-hydroxy carboxylic acid esters of pharmaceutical interest. (c) 2006 Elsevier Ltd. All rights reserved.