Highly enantioselective Henry reaction catalyzed by chiral tridentate heteroorganic ligands
摘要:
New tridentate enantiomerically pure heteroatom catalysts, containing hydroxyl, sulfinyl and amino groups, proved to be highly efficient in the enantioselective nitroaldol (Henry) reaction to give the desired adducts in very high yields (Lip to 90%) and with ees up to 98%. The influence of the stereogenic centres located on the sulfinyl sulfur atom and in the amine moiety is also discussed. (C) 2009 Elsevier Ltd. All rights reserved.