gave ethyl (R)‐8‐chloro‐6‐hydroxyoctanoate, a key precursor for the synthesis of (R)‐α‐lipoic acid, in high space‐time yield (530 g L−1 d−1) and with excellent enantiomeric excess (>99%). This bioprocess was shown to be viable on a 10‐L scale. This method provides a greener and more cost‐effective method for the industrial production of (R)‐α‐lipoic acid.
从副产念珠菌中分离出了一种新型的还原酶(Cp AR2),该酶对ε-酮酯(8-氯-6-氧代辛酸乙酯)具有异常高的活性。共表达Cp AR2和葡萄糖脱氢酶基因的大肠杆菌细胞对8-氯-6-氧代辛酸乙酯的不对称还原产生了(R)-8-氯-6-羟基辛酸乙酯,这是合成(R)-α-的关键前体硫辛酸,时空产率高(530 g L -1 d -1),对映体过量极佳(> 99%)。该生物过程显示出在10 L规模上可行。这种方法为工业生产(R)-α-硫辛酸
Enantioselective bioreductive preparation of chiral halohydrins employing two newly identified stereocomplementary reductases
reductases were stable at elevated substrate loading. Enzymatic characterization revealed that DhCR and CgCR were more thermostable. As much as 330 g COBE in 1 L biphasic reaction mixture was reduced to (S)- and (R)-3-hydroxy-4-chlorobutyrate by DhCR and CgCR (coexpressed with glucose dehydrogenase), with 92.5% and 93.0% yields, >99% ee, and total turnover numbers of 53 800 and 108 000, respectively
通过重新筛选羰基还原酶工具箱,鉴定出两种健壮的立体互补羰基还原酶(Dh CR和Cg CR)。通过活性和对映选择性测定,对α-氯-1-苯乙酮和4-氯-3-氧代丁酸乙酯(COBE)返回了五种还原酶。三种还原酶在增加的底物负载下稳定。酶促表征显示Dh CR和Cg CR更稳定。Dh CR和Cg将1 L双相反应混合物中多达330 g COBE还原为(S)-和(R)-3-羟基-4-氯丁酸酯CR(与葡萄糖脱氢酶共表达),产率为92.5%和93.0%,ee大于99%,总营业额分别为53 800和108 000。在负载为100 g L -1的情况下,其他六个α-卤代醇不对称还原为光学纯净形式。我们的结果表明这两种立体互补还原酶在合成有价值的药物α-卤代醇中的潜力。
Deep Eutectic Solvents as Media in Alcohol Dehydrogenase‐Catalyzed Reductions of Halogenated Ketones
作者:Fatima Zohra Ibn Majdoub Hassani、Saaid Amzazi、Joseph Kreit、Iván Lavandera
DOI:10.1002/cctc.201901582
日期:2020.2.6
greener media to obtain higher productivities and selectivities. In the present contribution, an eutectic mixture composed of choline chloride (ChCl): glycerol (1 : 2 mol/mol) has been used as a reaction medium in combination with Tris−SO4 50 mM buffer pH 7.5, applied to the alcoholdehydrogenase (ADH)‐catalyzed reduction of various carbonyl precursors of chiral halohydrins. These alcohols are key
‘Green’ synthesis of important pharmaceutical building blocks: enzymatic access to enantiomerically pure α-chloroalcohols
作者:Dunming Zhu、Chandrani Mukherjee、Ling Hua
DOI:10.1016/j.tetasy.2005.08.037
日期:2005.10
α-chloroketones, the precursors of pharmaceutically valuable α-chloroalcohols. Several highly active and enantioselective ketoreductases were found and their applications to the synthesis of both enantiomers of these α-chloroalcohols were demonstrated on a preparative scale. This offers a convenient, ‘green’ access to this type of importantpharmaceuticalbuildingblocks.
Enzymatic ketone reduction: mapping the substrate profile of a short-chain alcohol dehydrogenase (YMR226c) from Saccharomyces cerevisiae
作者:Yan Yang、Dunming Zhu、Timothy J. Piegat、Ling Hua
DOI:10.1016/j.tetasy.2007.08.008
日期:2007.8
dehydrogenase (YMR226c) was found to effectively catalyze the enantioselective reductions of aryl-substituted acetophenones, α-chloroacetophenones, aliphatic ketones, and α- and β-ketoesters. While the enantioselectivity for the reduction of β-ketoesters was moderate, the acetophenone derivatives, aromatic α-ketoesters, some substituted α-chloroacetophenones, and aliphatic ketones were reduced to the