Asymmetric bioreduction of α,β-unsaturated nitriles and ketones
摘要:
Two applications for the asymmetric reduction of activated alkenes employing isolated enoate reductases are reported. A series of alpha,beta-unsturated nitriles were shown to be converted to the optically active nitrile products in high yields and excellent enantioselectivities (up to 99% ee). In addition, the reduction of 2,3-disubstituted cyclopenteriones was shown to provide almost exclusively trans-2,3-disubstituted cyclopentanones in high yield and enantiopurity (94% ee). (C) 2008 Elsevier Ltd. All rights reserved.
Substrate Evaluation of<i>Rhodococcus erythropolis</i>SET1, a Nitrile Hydrolysing Bacterium, Demonstrating Dual Activity Strongly Dependent on Nitrile Sub-Structure
作者:Tracey M. Coady、Lee V. Coffey、Catherine O'Reilly、Claire M. Lennon
DOI:10.1002/ejoc.201403201
日期:2015.2
Rhodococcus erythropolis SET1, a novel nitrilehydrolysing bacterial isolate, has been undertaken with 34 nitriles, 33 chiral and 1 prochiral. These substrates consist primarily of β-hydroxy nitriles with varying alkyl and aryl groups at the β position and containing in several compounds different substituents α to the nitrile. In the case of β-hydroxy nitriles without substitution at the α position
A Chiral Metal-Organic Material that Enables Enantiomeric Identification and Purification
作者:Shi-Yuan Zhang、Cheng-Xiong Yang、Wei Shi、Xiu-Ping Yan、Peng Cheng、Lukasz Wojtas、Michael J. Zaworotko
DOI:10.1016/j.chempr.2017.07.004
日期:2017.8
coupled with the thermal and hydrolytic stability of CMOM-3S, these features mean that a coated fusedsilicacapillarycolumn in which CMOM-3S serves as a CSP is both more versatile and more robust than three benchmark commercial columns. That the enantiomer with the longer GC retention time is consistently captured in CCS experiments enables CMOM-3S to serve as a powerful tool to enable both chiral purification
Enantiomer Separation of Nitriles and Epoxides by Crystallization with Chiral Organic Salts: Chirality Switching Modulated by Achiral Acids
作者:Koichi Kodama、Yuki Shimomura、Takuji Hirose
DOI:10.1021/acs.cgd.1c01003
日期:2021.11.3
with organic-salt type chiral hosts was achieved. The stereochemistry of the preferentially included nitrile could be switched only by changing the achiral carboxylic acid component. Crystallographic analysis of the inclusion crystals reveals that the hydrogen-bonding networks are controlled by the acidity of the phenol group of the acids, which results in chiralityswitching.
Dual electrocatalysis enables enantioselective hydrocyanation of conjugated alkenes
作者:Lu Song、Niankai Fu、Brian G. Ernst、Wai Hang Lee、Michael O. Frederick、Robert A. DiStasio、Song Lin
DOI:10.1038/s41557-020-0469-5
日期:2020.8
Chiralnitriles and their derivatives are prevalent in pharmaceuticals and bioactive compounds. Enantioselective alkene hydrocyanation represents a convenient and efficient approach for synthesizing these molecules. However, a generally applicable method featuring a broad substrate scope and high functional group tolerance remains elusive. Here, we address this long-standing synthetic problem using
Enantioselective Decarboxylative Cyanation Employing Cooperative Photoredox Catalysis and Copper Catalysis
作者:Dinghai Wang、Na Zhu、Pinhong Chen、Zhenyang Lin、Guosheng Liu
DOI:10.1021/jacs.7b09802
日期:2017.11.8
The merger of photoredoxcatalysis with asymmetric copper catalysis have been realized to convert achiral carboxylic acids into enantiomerically enriched alkyl nitriles. Under mild reaction conditions, the reaction exhibits broad substrate scope, high yields and high enantioselectivities. Furthermore, the reaction can be scaled up to synthesize key chiral intermediates to bioactive compounds.