[EN] IMIDAZOLINE RECEPTOR TYPE 1 LIGANDS FOR USE AS THERAPEUTICS [FR] LIGANDS DU RÉCEPTEUR AUX IMIDAZOLINES DE TYPE 1 À UTILISER EN TANT QU'AGENTS THÉRAPEUTIQUES
Chiral Surfactant-Type Catalyst for Asymmetric Reduction of Aliphatic Ketones in Water
作者:Jiahong Li、Yuanfu Tang、Qiwei Wang、Xuefeng Li、Linfeng Cun、Xiaomei Zhang、Jin Zhu、Liangchun Li、Jingen Deng
DOI:10.1021/ja308357y
日期:2012.11.14
A novel chiral surfactant-type catalyst is developed. Micelles formed in water by association of the catalysts themselves, and this was confirmed by TEM analyses. Asymmetric transfer hydrogenation of aliphaticketones catalyzed by the chiral metallomicellar catalyst gave good to excellent conversions and remarkable stereoselectivities (up to 95% ee). Synergistic effects between the metal-catalyzed
开发了一种新型手性表面活性剂型催化剂。通过催化剂本身的结合在水中形成胶束,这通过 TEM 分析得到证实。由手性金属胶束催化剂催化的脂肪族酮的不对称转移氢化具有良好到优异的转化率和显着的立体选择性(高达 95% ee)。金属催化中心与金属胶束中核心的疏水微环境之间的协同作用导致高对映选择性。
Screening method for the evaluation of asymmetric catalysts for the reduction of aliphatic ketones
ATH reductions of aliphaticketones in water catalyzed by ruthenium coordinated by prolinamide ligands produce alcohols with moderate enantiomeric excesses in most cases. A set of seven aliphaticketones is proposed for a rapid evaluation of the enantioselectivity of catalysts by one-pot multi-substrates reduction. The screening of a library of prolinamides shows that according to the structure of
Asymmetric reduction of ketones by Geotrichum candidum in the presence of AmberliteTM XAD, a solid organic solvent
作者:Kaoru Nakamura、Mikio Fujii、Yoshiteru Ida
DOI:10.1039/b005204n
日期:——
A hydrophobic polymer, Amberlite™ XAD, was used as material to control the stereochemical course of microbial reductions. In the presence of XAD, simple aliphatic and aromatic ketones were reduced to the corresponding (S)-alcohols in excellent enantiomeric excess (ee) while low enantioselectivities were observed in the absence of the polymer.
the corresponding ketone using 2-propanol as hydrogen donor or by enantioselectiveoxidationthrough kinetic resolution of the rac-alcohol using acetone as hydrogen acceptor employing whole lyophilized cells of Rhodococcus ruber DSM 44541. The microbialoxidation/reduction system exhibits not only excellent stereo- and enantioselectivity but also a broad substrate spectrum. Due to the exceptional tolerance