编码,显示出对多种酮具有高对映选择性的通用基因的基因SCR(酿酒酵母羰基还原酶)已在大肠杆菌中鉴定,克隆和表达。已经构建了具有高NADPH再生能力的两种类型的表达系统。一个是串联系统,其中编码SCR和GDH(葡萄糖脱氢酶)的基因位于同一质粒中,另一个是双质粒系统,其中SCR和GDH的每个基因位于可以共存的单独质粒中在一个大肠杆菌细胞中 重组大肠杆菌不对称还原酮细胞产生合成有用的20种醇,其中11种对映体纯。这些产品之一的生产率高达41 g / L。
Preparation of Sulfur-Containing Optically Active Secondary Alcohols Based on<i>Pichia farinosa</i>-Catalyzed<i>anti</i>-Prelog-Rule Reduction as the Key Step
A Pichia farinosa IAM 4682 mediated reduction of sulfur containing ketones afforded secondaryalcohols with (R)-absolute configuration. For example, 4-(phenylthio)-2-butanone and 4-(phenylsulfonyl)-2-butanone afforded (R)-4-(phenylthio)-2-butanol (91%ee) in 90% yield and (R)-4-(phenylsulfonyl)-2-butanol (97%ee) in 94% yield, respectively. In the case that the ee of the product was not satisfactory
Pichia farinosa IAM 4682 介导的含硫酮还原得到具有 (R)-绝对构型的仲醇。例如,4-(苯硫基)-2-丁酮和4-(苯磺酰基)-2-丁酮以90%的产率提供(R)-4-(苯硫基)-2-丁醇(91%ee)和(R)- 4-(苯磺酰基)-2-丁醇(97%ee)分别为94%产率。在产品的ee不令人满意的情况下,任何污染的(S)-对映体被玫瑰色红球菌IFO 15564选择性氧化,留下纯的(R)-对映体。进一步检查了粉状毕赤酵母介导的还原和玫瑰色红球菌介导的氧化的底物特异性。
Facile Synthesis of Optically-Active γ-Valerolactone from Levulinic Acid and Its Esters Using a Heterogeneous Enantio-Selective Catalyst
作者:Tsutomu Osawa、Yuya Tanabe
DOI:10.1007/s10562-017-2291-2
日期:2018.3
levulinic acid and its esters. A tartaric acid-NaBr-modified nickel catalyst produced the optically-active γ-valerolactone with a 60% enantiomeric excess (ee), almost quantitative conversion and chemoselectivity. The synthesis of the optically-active γ-valerolactone using the enantio-selective heterogeneous catalyst would be promising for the large-scale industrial production from levulinic acid and its
The gene encoding a versatile biocatalyst that shows high enantioselectivity for a variety of ketones, SCR (Saccharomyces cerevisiae carbonyl reductase), has been identified, cloned, and expressed in E coli. Recombinant E coli co-producing SCR and GDH (glucose dehydrogenase) is an easy-to-use, synthetically useful biocatalyst, and 8 out of the 16 alcohols obtained had enantiomeric purities of >98% ee. (C) 2005 Elsevier Ltd. All rights reserved.
Lipase-catalyzed preparation of optically active .gamma.-butyrolactones in organic solvents