Studies on Phosphoroheterocycle Chemistry III: An Unusual Way to 1,3,2-Thiazaphospholidine-4-thione 2-Sulfide Derivatives
作者:ShengLou Deng、RuYu Chen
DOI:10.1055/s-2002-35619
日期:——
An unusual but efficient method for the synthesis of phosphoroheterocycles, 1,3,2-thiazaphospholidine-4-thione 2-sulfide derivatives, by the reaction of Lawesson'sreagent with a variety of u-hydroxy nitriles has been developed. The possible mechanism of the reaction is proposed to involve thiation of hydroxy group in a first step, sequential addition of P-SH to the nitrile and rearrangement resulting
A new (R)-hydroxynitrile lyase from Prunus mume: asymmetric synthesis of cyanohydrins
作者:Samik Nanda、Yasuo Kato、Yasuhisa Asano
DOI:10.1016/j.tet.2005.08.105
日期:2005.11
A new hydroxynitrile lyase (HNL) was isolated from the seed of Japanese apricot (Prunus mume). The enzyme has similar properties with HNL isolated from other Prunus species and is FAD containing enzyme. It accepts a large number of unnatural substrates (benzaldehyde and its variant) for the addition of HCN to produce the corresponding cyanohydrins in excellent optical and chemical yields. A new HPLC
Preparation and characterization of some α,α-disubstituted-α-hydroxythiolesters
作者:Wilma E. Elias
DOI:10.1139/v70-614
日期:1970.12.1
A series of α,α-disubstituted-α-hydroxythiolesters has been prepared from ketone cyanohydrins by the Pinner reaction. The esters have been characterized both by classical methods and by analysis of...
preparation of (S)-2-cyanopiperidine 4 provides a new access to 2-substituted piperidines. This synthesis is based on an enantioselective (R)-oxynitrilase-catalyzed reaction for the preparation of (R)-(+)-6-bromo-2-hydroxyhexanenitrile 1 and the subsequent cyclization of this compound to yield the piperidine ring. The utilization of 4 as the starting material for the synthesis of (S)-2-aminomethylpiperidine
Optically active (S)-ketone- and (R)-aldehyde-cyanohydrins via an (R)-oxynitrifase-catalysed transcyanation. Chemoenzymatic syntheses of 2-cyanotetrahydrofuran and 2-cyanotetrahydropyran
(R)-Oxynitrilase catalyses the enantioselective decyanation of racemic ketone cyanohydrins and the enantioselective addition of HCN to ω-bromoaldehydes in one step.