CH键的对映选择性氧基官能化是一个非常有趣的反应,因为它提供了获得重要药物组成部分的手性醇的途径。但是,使用传统方法很难实现。一种可以实现的方法是通过氧化酶的作用。尽管已经发表了许多关于酶的氧官能化能力的分析报告,但有关使用酶以合成相关规模实现氧官能化的报告却很少。在这里,我们描述了4-乙基苯酚向(R基)-1-(4'-羟基苯基)使用依赖黄素的酶香草醇氧化酶乙醇。通过测试不同的反应介质,底物和酶的浓度,并在氧气气氛下进行操作,对工艺进行了优化。在最佳反应条件下,从10 g 4-乙基苯酚中获得4.10 g(R)-1-(4'-羟基苯基)乙醇,其ee值为97%(分离产率为36%)。这些结果凸显了在将酶的氧化官能化工艺放大至合成相关规模时可能会遇到的一些挑战,这些挑战将可用于开发用于合成工业相关化合物的酶工艺。
the corresponding ketone using 2-propanol as hydrogen donor or by enantioselectiveoxidationthrough kinetic resolution of the rac-alcohol using acetone as hydrogen acceptor employing whole lyophilized cells of Rhodococcus ruber DSM 44541. The microbialoxidation/reduction system exhibits not only excellent stereo- and enantioselectivity but also a broad substrate spectrum. Due to the exceptional tolerance
Facile Access to Chiral Alcohols with Pharmaceutical Relevance Using a Ketoreductase Newly Mined from<i>Pichia guilliermondii</i>
作者:Guochao Xu、Huilei Yu、Jianhe Xu
DOI:10.1002/cjoc.201201119
日期:2013.3
biocatalytic reduction of prochiral ketones offers significant potential in the synthesis of optically active alcohols. A CmCR homologous carbonyl reductase from Pichia guilliermondii NRRL Y‐324 was successfully overexpressed. Substrate profile characterization revealed its broad substrate specificity, covering arylketones, aliphatic ketones and ketoesters. Furthermore, a variety of ketone substrates
Multienzyme One-Pot Cascade for the Stereoselective Hydroxyethyl Functionalization of Substituted Phenols
作者:Stefan E. Payer、Hannah Pollak、Benjamin Schmidbauer、Florian Hamm、Filip Juričić、Kurt Faber、Silvia M. Glueck
DOI:10.1021/acs.orglett.8b02058
日期:2018.9.7
The operability and substrate scope of a redesigned vinylphenol hydratase as a single biocatalyst or as part of multienzyme cascades using either substituted coumaric acids or phenols as stable, cheap, and readily available substrates are reported.
Efficient Enantioselective Reduction of Ketones with <i>Daucus carota</i> Root
作者:J. S. Yadav、S. Nanda、P. Thirupathi Reddy、A. Bhaskar Rao
DOI:10.1021/jo010399p
日期:2002.5.1
active alcohols are the potential chiral building blocks for the synthesis of pharmaceutically important molecules and asymmetricchiral ligands. Hence, this biocatalytic approach is found to be the most suitable for the preparation of a wide range of chiralalcohols and gave inspiration for the development of a new biotechnological process.
An Enantioconvergent Benzylic Hydroxylation Using a Chiral Aryl Iodide in a Dual Activation Mode
作者:Ayham H. Abazid、Nils Clamor、Boris J. Nachtsheim
DOI:10.1021/acscatal.0c02321
日期:2020.8.7
chiral iodoarene in a direct enantioselective hydroxylation of alkyl arenes is reported. This method allows the rapid synthesis of chiral benzyl alcohols in high yields and stereocontrol, despite its nontemplated nature. In a cascade activation consisting of an initial irradiation-induced radical C–H-bromination and a consecutive enantioconvergent hydroxylation, the iodoarene catalyst has a dual role. It