Prunus armeniaca hydroxynitrile lyase (ParsHNL)-catalyzed asymmetric synthesis of cyanohydrins from sterically demanding aromatic aldehydes
摘要:
Herein we report the biocatalytic asymmetric synthesis of cyanohydrins by using a new (R)-HNL from Prunus armeniaca. Several sterically demanding aromatic aldehydes which have never been used as substrates for any known HNLs are employed for the new (R)-HNL from A armeniaca, The cyanohydrins synthesized are obtained in good chemical yield with excellent enantioselectivities. (C) 2009 Elsevier Ltd. All rights reserved.
CO
<sub>2</sub>
‐Enabled Cyanohydrin Synthesis and Facile Iterative Homologation Reactions**
作者:Martin Juhl、Allan R. Petersen、Ji‐Woong Lee
DOI:10.1002/chem.202003623
日期:2021.1.4
to accelerate cyanohydrin synthesis under neutral conditions with an insoluble cyanide source (KCN) without generating toxic HCN. Under inert atmosphere, the reaction is essentially not operative due to the unfavored equilibrium. The utility of CO2‐mediated selective cyanohydrin synthesis was further showcased by broadening Kiliani–Fischersynthesis under neutral conditions. This protocol offers an
Method of producing optically active alpha-hydroxy acid or alpha-hydroxyamide
申请人:NITTO CHEMICAL INDUSTRY CO., LTD.
公开号:EP0711836A1
公开(公告)日:1996-05-15
A reaction system, wherein a cyanohydrin is converted into an optically active α-hydroxy acid or α-hydroxyamide via a treatment in a reaction tank (f) with a microorganism, is provided with an automatic cyanohydrin controller (h) comprising a cyano ion detector (a), a regulator (b) and a cyanohydrin supplier (i) and (j) linked thereto. The reaction is performed while automatically controlling the cyanohydrin concentration.
Thus cyanohydrin can be supplied under automatic control at a relatively low and constant concentration on the basis of its consumption ratio. The reaction rate of the catalyst can be continuously regarded as the rate-limiting factor. As a result, a decrease in the enzymatic activity during the reaction can be suppressed and an optically active α-hydroxy acid or α-hydroxyamide can be efficiently obtained at a high yield.