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