Kinetic resolution of mandelate esters via stereoselective acylation catalyzed by lipase PS-30
作者:Peiran Chen、Wenhong Yang
DOI:10.1016/j.tetlet.2014.02.095
日期:2014.4
By using lipase PS-30 as catalyst, the kineticresolution of a series of racemic mandelate esters has been achieved via stereoselective acylation. The value of kinetic enantiomeric ratio (E) reached up to 197.5. Substituent effect is briefly discussed.
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