The Synthesis of Chiral α-Aryl α-Hydroxy Carboxylic Acids via RuPHOX-Ru Catalyzed Asymmetric Hydrogenation
作者:Huan Guo、Jing Li、Delong Liu、Wanbin Zhang
DOI:10.1002/adsc.201700846
日期:2017.10.25
A ruthenocenyl phosphino‐oxazoline‐ruthenium complex (RuPHOX−Ru) catalyzedasymmetrichydrogenation of α‐aryl keto acids has been successfully developed, affording the corresponding chiral α‐aryl α‐hydroxy carboxylic acids in high yields and with up to 97% ee. The reaction could be performed on a gram scale with a relatively low catalyst loading (up to 5000 S/C) and the resulting products can be transformed
已成功开发了钌烯基膦基-恶唑啉-钌络合物(RuPHOX-Ru)催化的α-芳基酮酸不对称氢化反应,可提供高收率和ee高达97%的相应手性α-芳基α-羟基羧酸。该反应可以在相对较低的催化剂负载量(至多5000 S / C)下以克为单位进行,所得产物可以转化为几种手性结构单元,生物活性化合物和手性药物。
Convenient Divergent Strategy for the Synthesis of TunePhos-Type Chiral Diphosphine Ligands and Their Applications in Highly Enantioselective Ru-Catalyzed Hydrogenations
作者:Xianfeng Sun、Le Zhou、Wei Li、Xumu Zhang
DOI:10.1021/jo702068w
日期:2008.2.1
convenient, divergent strategy for the synthesis of a series of modular and fine-tunable C3-TunePhos-type chiral diphosphineligands and their applications in highlyefficient Ru-catalyzed asymmetrichydrogenations were explored. Up to 97 and 99% ee values were achieved for the enantioselective synthesis of β-methyl chiral amines and α-hydroxy acid derivatives, respectively.
Highly Enantioselective Hydrogenation of α-Keto Esters Catalyzed by Ru-Tunephos Complexes
作者:Xumu Zhang、Chun-Jiang Wang、Xianfeng Sun
DOI:10.1055/s-2006-932461
日期:——
Various enantiomerically pure α-hydroxy esters were synthesized by asymmetric hydrogenation of α-keto esters catalyzed by Ru-C n -Tunephos complex. Up to 97.1% ee has been achieved for both α-aryl and α-alkyl substituted α-keto esters.
通过由Ru-C n -Tunephos 配合物催化的α-酮酯的不对称氢化合成了各种对映体纯α-羟基酯。α-芳基和 α-烷基取代的 α-酮酯的 ee 高达 97.1%。
Dual Pathway for the Asymmetric Transfer Hydrogenation of α-Ketoimides to Chiral α-Hydroxy Imides or Chiral α-Hydroxy Esters
作者:Qiankun Zhao、Yuxi Zhao、Hang Liao、Tanyu Cheng、Guohua Liu
DOI:10.1002/cctc.201500906
日期:2016.1
two types of chiral products through a controllable strategy in asymmetric catalysis. Herein, we develop Ru‐catalysed asymmetrictransferhydrogenation of α‐ketoimides to realise an enantioselective construction of chiral α‐hydroxy imides or chiral α‐hydroxy esters. The transformation of α‐ketoimides catalysed by (S,S)‐[RuCl(η6‐mesitylene)diamine] can afford various chiral α‐hydroxy imides with high yields
environmentally benign character of iron mean that it is an ideal alternative to precious metals in catalysis. Recent growth in the number of iron-catalysed reactions reported reflects an increasing demand for sustainable chemistry. Only a limited number of chiral iron catalysts have been reported and these have, in general, proven less enantioselective than other transition-metal catalysts, thus limiting their