Dynamic kinetic resolution of racemic N-phthalyl amino acids using (S)-α-methylpantolactone as the chiral auxiliary
摘要:
A dynamic kinetic resolution of racemic N-phthalyl amino acids by stereoselective esterification was examined using (S)-alpha-methylpantolactone as the chiral auxiliary. The reaction of various racemic N-phthalyl amino acids with this chiral alcohol in the presence of both DCC and DMAP afforded predominantly the (S,S)-esters in nearly quantitative yield. (C) 2000 Elsevier Science Ltd. All rights reserved.
Highly Homogeneous Stereocontrolled Construction of Quaternary Hydroxyesters by Addition of Dimethylzinc to α-Ketoesters Promoted by Chiral Perhydrobenzoxazines and B(OEt)3
作者:Rebeca Infante、Javier Nieto、Celia Andrés
DOI:10.1002/chem.201102913
日期:2012.4.2
A highly efficient enantioselective addition of Me2Zn to α‐ketoesters, assisted by a chiral perhydro‐1,3‐benzoxazine ligand, is described. This novel catalytic system offers homogeneous elevated enantioselectivities in the preparation of α‐hydroxyesters that bear a quaternary stereocenter, with a minor dependence on electronic and steric effects when aromatic, heteroaromatic, or aliphatic α‐ketoesters