Asymmetric reduction of ketones by Geotrichum candidum in the presence of AmberliteTM XAD, a solid organic solvent
作者:Kaoru Nakamura、Mikio Fujii、Yoshiteru Ida
DOI:10.1039/b005204n
日期:——
A hydrophobic polymer, Amberlite™ XAD, was used as material to control the stereochemical course of microbial reductions. In the presence of XAD, simple aliphatic and aromatic ketones were reduced to the corresponding (S)-alcohols in excellent enantiomeric excess (ee) while low enantioselectivities were observed in the absence of the polymer.
Racemization in combination with a kineticresolution is the base for a dynamic kineticresolution (DKR). Biocatalytic racemization was successfully performed for a broad scope of sec‐alcohols by employing a single alcohol dehydrogenase (ADH) variant from Thermoanaerobacter pseudoethanolicus (formerly T. ethanolicus; TeSADH W110A I86A C295A). The catalyst employed as a lyophilized whole cell preparation
Convergent Catalytic Asymmetric Synthesis of Esters of Chiral Dialkyl Carbinols
作者:Ze-Peng Yang、Gregory C. Fu
DOI:10.1021/jacs.0c01324
日期:2020.3.25
Because chiral dialkyl carbinols, as well as their derived esters, are significant as intermediates and end points in fields such as organic, pharmaceutical, and biological chemistry, the development of efficient approaches to their asymmetric synthesis is an important endeavor. In this report, we describe a method for the direct catalytic enantioselective synthesis of such esters, beginning with an
Fungal mediated kinetic resolution of racemic acetates to ( R )-alcohols using Fusarium proliferatum
作者:Dipesh D. Jadhav、Harshal S. Patil、Patil S. Chaya、Hirekodathakallu V. Thulasiram
DOI:10.1016/j.tetlet.2016.08.084
日期:2016.10
Fungal mediated kineticresolution of seven acyclic/aromatic acetates was achieved using Fusarium proliferatum to furnish (R)-alcohols in high enantiomeric excess (>95%). The kineticresolution was established as one-pot two-step de-esterification/oxidation biocatalyticprocess. Further, the preparative scale synthesis of (R)-(+)-1-phenylethanol was accomplished through de-esterification/oxidation
transformation of enones was investigated with cultured cells of Synechococcus sp. PCC 7942 (a cyanobacterium). The cells reduced both the endocyclic C-C double bond of s-trans enones and the exocyclic C-C double bond of s-cis enones with high enantioselectivity to afford optically active α-substituted (S)-ketones under illumination. In addition, the reduction of the double bond of these enones was accompanied
用聚球藻的培养细胞研究了烯酮的不对称转化。PCC 7942(一种蓝细菌)。细胞以高对映选择性减少了 s-trans enones 的内环 CC 双键和 s-cis enones 的外环 CC 双键,以在光照下提供光学活性的 α-取代 (S)-酮。此外,这些烯酮双键的还原伴随着饱和醇的形成。细胞优先将简单的脂肪酮而不是环状酮还原为相应的(S)-醇,具有出色的对映选择性。