Synthesis of novel chiral oxazoline-Schiff base ligands for the catalytic asymmetric chlorination of β-keto esters
作者:Ming-Hui Qi、Fei-Jun Wang、Min Shi
DOI:10.1016/j.tetasy.2010.02.003
日期:2010.2
A series of novel monooxazoline-Schiff baseligands 1 has been successfully synthesized. The Cu(I)–1a complex showed excellent catalytic activities with up to 83% ee for the asymmetric α-chlorination of β-ketoesters.
Chiral Amino Diol Derivatives as New Modular Organocatalysts for the Enantioselective α-Chlorination of Cyclic β-Keto Esters
作者:Pablo Etayo、Ramón Badorrey、María D. Díaz-de-Villegas、José A. Gálvez
DOI:10.1002/adsc.201000594
日期:2010.12.17
Highly modularchiralaminodiolderivatives have been used as organocatalysts in the enantioselectiveα-chlorination of cyclicβ-ketoesters. Optimization of the catalyst structure and the reaction conditions has allowed the synthesis of optically active α-chlorinated products with high enantioselectivities (up to 96% ee) using inexpensive commercially available N-chlorosuccinimide (NCS) as the chlorine