Polyfunctional ()-2-hydroxycarboxylic acids by reduction of 2-oxo acids with hydrogen gas or formate and resting cells of proteus vulgaris
作者:Anita Schummer、Hongtao Yu、Helmut Simon
DOI:10.1016/s0040-4020(01)86506-6
日期:1991.11
Various ()-2-hydroxy acids such as ()-2-hydroxy-3-enoic-, 3,5-dienoic-, 4-oxo-, ()-3-hydroxy and some others were prepared on a scale up to 0.12 mol by biocatalytic reduction of the corresponding 2-oxo acids with P. vulgaris and hydrogen gas and/or formate as electron donors. With the exception of the 2-hydroxy-4-oxo acids it could be proved that the enantiomeric excess is > 97%. For the 4-oxo derivatives
Preparative Asymmetric Synthesis of Canonical and Non‐canonical α‐amino Acids Through Formal Enantioselective Biocatalytic Amination of Carboxylic Acids
Chemical and biocatalytic synthesis of non‐canonical α‐amino acids (ncAAs) from renewable feedstocks and using mild reaction conditions has not efficiently been solved. Here, we show the development of a three‐step, scalable and modular one‐pot biocascade for linear conversion of renewable fatty acids (FAs) into enantiopure l‐α‐amino acids. In module 1, selective α‐hydroxylation of FAs is catalyzed
从可再生原料和使用温和的反应条件化学和生物催化合成非规范α-氨基酸(ncAAs)尚未得到有效解决。在这里,我们展示了一种三步,可扩展且模块化的单锅生物梯级的开发,该级联可将可再生脂肪酸(FAs)线性转化为对映纯l -α-氨基酸。在模块1中,P450过氧合酶P450 CLA催化FA的选择性α-羟基化。通过使用自动化的H 2 O 2补充系统,可以将多种FA(C6:0至C16:0)的FA有效转化(46%至> 99%; TTN> 3300),转化为有价值的α-羟基酸(α-HAs; > 90%α-选择性)以制备规模显示(最大2.3 g L -1隔离产品)。在模块2中,氧化还原-中性氢借入级联反应(酒精脱氢酶/氨基酸脱氢酶)使α-HAs进一步转化为l -α-AAs(20%至99%)。对映体纯的l -α-AAs(ee> 99%),包括药物合成的l-高苯丙氨酸,产品滴定度最高可达2.5 g L -1。该生
Biocatalytic Oxidative Cascade for the Conversion of Fatty Acids into α-Ketoacids via Internal H<sub>2</sub>
O<sub>2</sub>
Recycling
sources. An atom-efficient biocatalytic oxidative cascade was developed for the conversion of saturated fatty acids to α-ketoacids. Employment of P450 monooxygenase in the peroxygenase mode for regioselective α-hydroxylation of fatty acids combined with enantioselective oxidation by α-hydroxyacid oxidase(s) resulted in internal recycling of the oxidant H2 O2 , thus minimizing degradation of ketoacid product
Enantioselective biocatalytic formal α-amination of hexanoic acid to<scp>l</scp>-norleucine
作者:Alexander Dennig、Somayyeh Gandomkar、Emmanuel Cigan、Tamara C. Reiter、Thomas Haas、Mélanie Hall、Kurt Faber
DOI:10.1039/c8ob02212g
日期:——
cascade was designed for the enantioselective formal α-amination of hexanoic acid to L-norleucine. Regioselective hydroxylation by P450CLA peroxygenase to 2-hydroxyhexanoic acid was followed by oxidation to the ketoacid by two stereocomplementary dehydrogenases. Combination with final stereoselective reductiveamination by aminoacid dehydrogenase furnished L-norleucine in >97% ee.
COMPOSITIONS COMPRISING POLYMERS PREPARED FROM 2-HYDROXYALKYL ACIDS
申请人:Moeller Michael
公开号:US20130131190A1
公开(公告)日:2013-05-23
Described herein are compositions comprising polymers prepared by melt polycondensation of 2-hydroxyalkyl acids. Methods of making and using the compositions are also disclosed.