ortho‐substituted phenyl glycidyl ethers and para‐nitrostyrene oxide. Worthy of note is that the substrate structure remarkably affected the enantioselectivities of the enzyme, as a reversed (S)‐enantiopreference was unexpectedly observed for the ortho‐nitrophenyl glycidyl ether. As a proof‐of‐concept, five enantiopure epoxides (>99% ee) were obtained in high yields, and a gram‐scale preparation of
50 mM−1 s−1) of purified GmEH3 for (S)-5a was slightly higher than that (kcatR/KmR = 1.52 mM−1 s−1) for (R)-5a, whereas the kcat/Km (5.16 mM−1 s−1) for (S)-7a was much higher than that (0.09 mM−1 s−1) for (R)-7a. Using 200 mg/mL wet cells of E. coli/gmeh3 as the biocatalyst, the scale-up enantioconvergent hydrolysis of 150 mM rac-5a at 25 °C for 1.5 h afforded (R)-5b with 90.2% eep and 95.4% yieldp
基于计算机辅助分析,从大豆中挖掘出一种新型环氧化物水解酶,命名为Gm EH3。然后,克隆了Gm EH3编码基因gmeh3 ,并在大肠杆菌Rosetta(DE3)中成功表达。在所研究的十种外消旋环氧化物中, Gm EH3 在外消旋间氯苯乙烯氧化物 ( 5a ) 的不对称水解中具有最高和最好的互补区域选择性(区域选择性系数, α S = 93.7% 和 β R = 97.2%),并且对外消旋苯基缩水甘油醚 ( 7a ) 具有最高的对映选择性(对映体比率, E = 55.6)。纯化的Gm EH3 对 ( S )- 5a的催化效率 ( k cat S / K m S = 2.50 mM -1 s -1 ) 略高于 ( k cat R / K m R = 1.52 mM -1 s - ) 1 ) ( R )- 5a ,而 ( S )- 7a的k cat / K m (5.16 mM −1 s −1 )
CYCLOPROPANECARBOXYLIC ACID GPR120 MODULATORS
申请人:BRISTOL-MYERS SQUIBB COMPANY
公开号:US20170253554A1
公开(公告)日:2017-09-07
The present invention provides compounds of Formula (I): or a stereoisomer, or a pharmaceutically acceptable salt thereof, wherein all of the variables are as defined herein. These compounds are GPR120 G protein coupled receptor modulators which may be used as medicaments
Jacobsen-type enantioselective hydrolysis of aryl glycidyl ethers.<sup>31</sup>P NMR analysis of the enantiomeric composition of oxiranes
作者:A. A. Bredikhin、E. I. Strunskaya、V. G. Novikova、N. M. Azancheev、D. R. Sharafutdinova、Z. A. Bredikhina
DOI:10.1023/b:rucb.0000024851.29744.21
日期:2004.1
The enantioselective partial hydrolysis of a number of racemic arylglycidylethers in the presence of chiral Co(salen)-catalyst was studied. The enantiomeric composition of the isolated (R)-aryl glycidylethers was analyzed by 31P NMR using optically active substituted 2-chloro-1,3,2-dioxaphospholanes. A synthesis of β-adrenoblocking agents (S)-toliprolol and (S)-moprolol based on the simultaneously
Chiral Nanoporous Metal–Metallosalen Frameworks for Hydrolytic Kinetic Resolution of Epoxides
作者:Chengfeng Zhu、Guozan Yuan、Xu Chen、Zhiwei Yang、Yong Cui
DOI:10.1021/ja302340b
日期:2012.5.16
recyclable heterogeneous catalyst for hydrolytickineticresolution (HKR) of racemic epoxides with up to 99.5% ee. The MOF structure brings Co(salen) units into a highly dense arrangement and close proximity that enhances bimetallic cooperative interactions, leading to improved catalytic activity and enantioselectivity in HKR compared with its homogeneous analogues, especially at low catalyst/substrate ratios