Asymmetric Domino Multicatalysis for the Synthesis of 3-Substituted Phthalides: Cinchonine/NHC Cooperative System
作者:So Won Youn、Hyoung Sub Song、Jong Hyub Park
DOI:10.1021/ol5000617
日期:2014.2.7
chiral bifunctional cinchonine, are mutually compatible and operating concurrently and effectively to promote the asymmetricdomino oxidation/oxa-Michael addition reaction. This protocol allowed access to both enantiomers of a product by using two natural, inexpensive pseudoenantiomeric cinchona alkaloids, cinchonine and cinchonidine, as well as to phthalides containing a chiral quaternary carbon center