A chiral phenol–NHC ligand enabled the copper-catalyzed enantioselectiveconjugate reduction of α,β-unsaturatedesters. The phenol moiety of the chiral NHC ligand played a critical role in producing the enantiomerically enriched products. The catalyst worked well for various (Z)-isomer substrates. Opposite enantiomers were obtained from (Z)- and (E)-isomers, with a higher enantiomeric excess from the
Lipase catalysed kinetic resolutions of 3-aryl alkanoic acids
作者:Rebecca E. Deasy、Maude Brossat、Thomas S. Moody、Anita R. Maguire
DOI:10.1016/j.tetasy.2010.12.019
日期:2011.1
Hydrolase catalysed kinetic resolutions leading to a series of 3-aryl alkanoic acids (>= 94% ee) are described. Hydrolysis of the ethyl esters with a series of hydrolases was undertaken to identify biocatalysts that yield the corresponding acids with excellent enantiopurity in each case. Steric and electronic effects on the efficiency and enantioselectivity of the biocatalytic transformation were also explored. (C) 2011 Elsevier Ltd. All rights reserved.
<i>N</i>,<i>N</i>-Dimethylformamide as Hydride Source in Nickel-Catalyzed Asymmetric Hydrogenation of α,β-Unsaturated Esters
作者:Siyu Guo、Jianrong (Steve) Zhou
DOI:10.1021/acs.orglett.6b02662
日期:2016.10.21
Asymmetric transfer hydrogenation of α,β-unsaturatedesters is realized by using a nickel/bisphosphine catalyst and N,N-dimethylformamide (DMF) as the hydride source.