Enzymatic stereodivergentsynthesis to access all possible product stereoisomers bearing multiple stereocenters is relatively undeveloped, although enzymes are being increasingly used in both academic and industrial areas. When two stereocenters and thus four stereoisomeric products are involved, obtaining stereodivergent enzyme mutants for individually accessing all four stereoisomers would be ideal
尽管酶越来越多地用于学术和工业领域,但酶促立体发散合成以获取所有可能的具有多个立体中心的产品立体异构体相对不发达。当涉及两个立体中心和四个立体异构产物时,获得立体发散酶突变体以单独访问所有四种立体异构体将是理想的。尽管在一般酶的定向进化方面取得了重大成功,但将一种酶立体发散工程化为四种高度立体互补的变体以获得带有多个立体中心的立体异构体的完整补充仍然是一个挑战。使用南极念珠菌脂肪酶 B (CALB) 作为模型,我们将这种酶的蛋白质工程报告为四种高度立体互补的变体,这些变体是在有机溶剂中外消旋酸和外消旋醇之间的酯交换反应中获得所有四种立体异构体所需的。通过生成和筛选每种异构体的少于 25 个变体,我们对模型反应中所有四种可能的立体异构体实现了 >90% 的选择性。这一困难的壮举是通过在酶结合口袋内衬的位点开发一种称为“集中合理迭代位点特异性诱变”(FRISM)的策略来完成的。使用一组有限的合
Probing the parallel kinetic resolution of 1-phenylethanol using quasi-enantiomeric oxazolidinone adducts
作者:Elliot Coulbeck、Jason Eames
DOI:10.1016/j.tetasy.2007.09.015
日期:2007.9
The parallel kinetic resolution of racemic 1-phenylethanol using an equimolar combination of quasi-enantiomeric oxazolidinones is discussed. The levels of diastereoselectivity were high leading to separable quasi-enantiomeric esters in good yield. (c) 2007 Elsevier Ltd. All rights reserved.
Highly efficient double enantioselection by lipase-catalyzed transesterification of (R,S)-carboxylic acid vinyl esters with (RS)-1-phenylethanol
作者:Hong Yang、Erik Henke、Uwe T Bornscheuer
DOI:10.1016/s0957-4166(99)00073-7
日期:1999.3
Transesterification of the title compounds using lipase B from Candida antarctica in toluene afforded the corresponding esters in good to excellent diastereomeric excess. (R)-2-Phenylpropionic acid-(R)-1-phenethyl ester 4 was isolated in 45% yield and 64% de after 2.5 h, whereas (R)-2-phenylbutyric acid-(R)-1-phenethyl ester 5 was obtained in 40% yield and 56% de after 35 h. A single recrystallization from n-hexane gave 4 with 98% de. In all reactions CAL-B showed excellent enantioselectivity (E > 100) toward (RS)-1-phenylethanol and moderate enantioselectivity (E similar to 10) toward both carboxylic acid vinyl esters. (C) 1999 Elsevier Science Ltd. All rights reserved.
JAHME, J.;RUCHARDT, C., ANGEW. CHEM., 1981, 93, N 10, 919-920
作者:JAHME, J.、RUCHARDT, C.
DOI:——
日期:——
Parallel Kinetic Resolution of 1-Phenylethanol Using <i>Quasi</i>-Enantiomeric Active Esters
作者:Jason Eames、Elliot Coulbeck
DOI:10.1055/s-2008-1032068
日期:2008.2
The parallel kinetic resolution of racemic 1-phenylethanol using an equimolar combination of quasi-enantiomeric pentafluorophenyl esters is discussed. The levels of diastereoselectivity were excellent (>88% de) leading to separable quasi-enantiomeric esters in good yields.