Chemoenzymatic Preparation of Enantiomerically Enriched (<i>R</i>)‐(–)‐Mandelic Acid Derivatives: Application in the Synthesis of the Active Agent Pemoline
作者:Marcin Poterała、Maciej Dranka、Paweł Borowiecki
DOI:10.1002/ejoc.201700161
日期:2017.4.26
resolution of several racemic derivatives of mandelic acid methyl ester catalyzed by lipases from Pseudomonas fluorescens (Amano AK) or Burkholderia cepacia (Amano PS-C II and Amano PS-IM) has been achieved. A gram-scale lipase-mediated kinetic resolution approach has been developed that allows the facilesynthesis of the corresponding methyl (R)-(–)-mandelates with excellent enantiomeric excesses (up to
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