Preparation of (S)-2-substituted succinates by stereospecific reductions of fumarate and derivatives with resting cells of Clostridium formicoaceticum
摘要:
Fumarate derivatives have been reduced to (S)-2-methylsuccinate 2a, (S)-2-ethylsuccinate 3a and (S)-2-chlorosuccinate 4a in up to 1 M concentrations with Clostridium formicoaceticum. Formate was the electron donor and viologens or anthraquinone-2,6-disulphonate acted as artificial electron mediators. Reductions with freeze-dried cells in (H2O)-H-2-buffers led to the (2R,3S)-[2,3-H-2]-dideuterated succinate derivatives. The productivity numbers(1) ranged from 450 to 5000 and the enantiomeric excess of all (S)-2-substituted succinates was greater than or equal to 99%.
Enantiospecific synthesis of 3-substituted aspartic acids via enzymic amination of substituted fumaric acids
作者:Mahmoud Akhtar、Botting Nigel P.、Cohen Mark A.、David Gani
DOI:10.1016/s0040-4020(01)87795-4
日期:——
The use of the enzyme 3-methylaspartase in the synthesis of L-aspartic acids containing 3-halogeno- or 3-alkyl- substituents, in the (S)-configuration, and also some of the corresponding C-3 deuteriated isotopomers is described.
COPOLYMERS AND COMPOSITIONS WITH ANTI-ADHESIVE AND ANTIMICROBIAL PROPERTIES
申请人:BASF SE
公开号:US20160235062A1
公开(公告)日:2016-08-18
The invention relates to a copolymer exhibiting both antimicrobial and anti-adhesive properties as well as to a hydrogel. Said hydrogel is obtained from the inventive copolymer and a substrate. Another part of the invention is a process for making the hydrogel, as well as different uses of the inventive copolymer as well as of the hydrogel.
Asymmetric synthesis of 2-substituted butane-1,4-diols by hydrogenation of homochiral fumaramide derivatives
作者:Samaila Jawaid、Louis J. Farrugia、David J. Robins
DOI:10.1016/j.tetasy.2004.11.023
日期:2004.12
Diastereoselective hydrogenation of homochiral fumaramides 1 derived from (2R)-Oppolzer's sultam was observed by analysis of the H-1 NMR spectra of the succinamide mixtures with de's of 77-88%. Reduction of these succinamides using LiAlH4 gave the corresponding (2S)-butane-1,4-diols and established that addition of hydrogen takes place selectively on the re-face of 14 fumaramides 1. The stereoselectivity was confirmed by estimating the ee's from the F-19 NMR spectra of the Mosher's diesters of the diols. This methodology was applied to the synthesis of selected pyrrolidine natural products in homochiral form. (C) 2004 Elsevier Ltd. All rights reserved.
Walden, Chemische Berichte, 1891, vol. 24, p. 2028
作者:Walden
DOI:——
日期:——
Demarcay, Annales de Chimie (Cachan, France), 1880, vol. <5> 20, p. 462