6732-41-8Relevant academic research and scientific papers
Biphasic Bioelectrocatalytic Synthesis of Chiral β-Hydroxy Nitriles
Dong, Fangyuan,Chen, Hui,Malapit, Christian A.,Prater, Matthew B.,Li, Min,Yuan, Mengwei,Lim, Koun,Minteer, Shelley D.
supporting information, p. 8374 - 8382 (2020/05/22)
Two obstacles limit the application of oxidoreductase-based asymmetric synthesis. One is the consumption of high stoichiometric amounts of reduced cofactor. The other is the low solubility of organic substrates, intermediates, and products in the aqueous phase. In order to address these two obstacles to oxidoreductase-based asymmetric synthesis, a biphasic bioelectrocatalytic system was constructed and applied. In this study, the preparation of chiral β-hydroxy nitriles catalyzed by alcohol dehydrogenase (AdhS) and halohydrin dehalogenase (HHDH) was investigated as a model bioelectrosynthesis, since they are high-value intermediates in statin synthesis. Diaphorase (DH) was immobilized by a cobaltocene-modified poly(allylamine) redox polymer on the electrode surface (DH/Cc-PAA bioelectrode) to achieve effective bioelectrocatalytic NADH regeneration. Since AdhS is a NAD-dependent dehydrogenase, the diaphorase-modified biocathode was used to regenerate NADH to support the conversion from ethyl 4-chloroacetoacetate (COBE) to ethyl (S)-4-chloro-3-hydroxybutanoate ((S)-CHBE) catalyzed by AdhS. The addition of methyl tert-butyl ether (MTBE) as an organic phase not only increased the uploading of COBE but also prevented the spontaneous hydrolysis of COBE, extended the lifetime of DH/Cc-PAA bioelectrode, and increased the Faradaic efficiency and the concentration of generated (R)-ethyl-4-cyano-3-hydroxybutyrate ((R)-CHCN). After 10 h of reaction, the highest concentration of (R)-CHCN in the biphasic bioelectrocatalytic system was 25.5 mM with 81.2% enantiomeric excess (eep). The conversion ratio of COBE achieved 85%, which was 8.8 times higher than that achieved with the single-phase system. Besides COBE, two other substrates with aromatic ring structures were also used in this biphasic bioelectrocatalytic system to prepare the corresponding chiral β-hydroxy nitriles. The results indicate that the biphasic bioelectrocatalytic system has the potential to produce a variety of β-hydroxy nitriles with different structures.
Isomerization of 3-unsubstituted 4,5-dihydroisoxazoles over alumina. A new synthesis of β-hydroxy nitriles
Mochalov,Fedotov,Trofimova,Gazzaeva,Zefirov
, p. 397 - 403 (2016/06/13)
3-Unsubstituted 4,5-dihydroisoxazoles obtained by nitrosation of arylcyclopropanes are capable of undergoing efficient isomerization into 3-aryl-3-hydroxypropanenitriles during chromatography on alumina.
METHOD FOR THE PREPARATION OF 3-SUBSTITUTED-3’-HYDROXYPROPIONITRILE
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Page/Page column 12, (2008/06/13)
The present invention relates to a method for the preparation of 3-substituted-3’-hydroxypropionitrile, more particularly, to a method for the preparation of 3-substituted-3’-hydroxypropionitrile which comprises performing ring opening of 1-substituted-ethylene oxide using sodium cyanide and citric acid in a range of pH 7.8 ~ 8.3 to provide 3-substituted-3’-hydroxypropionitrile in high optical purity and with high yield.
Efficient Lipase-Catalyzed Kinetic Resolution and Dynamic Kinetic Resolution of β-Hydroxy Nitriles. A Route to Useful Precursors for γ-Amino Alcohols
Pàmies, Oscar,B?ckvall, Jan-E.
, p. 726 - 731 (2007/10/03)
An efficient kinetic resolution of racemic β-hydroxy nitriles 1 was performed via Candida antarctica lipase (N-435)-catalyzed transesterification. A variety of racemic alkyl, aryl, and aryloxymethyl substituted β-hydroxy nitriles was efficiently transformed to the corresponding enantiomerically pure acetates (ee > 99% and conversion = 50%) with E values from 40 to > 1000. The combination of the enzymatic kinetic resolution with a ruthenium-catalyzed alcohol racemization led to a dynamic kinetic resolution (ee's up to 99%, yields up to 85%).
