CINCHONA-BASED BIFUNCTIONAL ORGANOCATALYSTS AND METHOD FOR PREPARING CHIRAL HEMIESTERS USING THE SAME
申请人:SONG Choong Eui
公开号:US20110213151A1
公开(公告)日:2011-09-01
The present invention relates to cinchona-based bifunctional organocatalysts and methods for preparing chiral hemiesters using the same. More specifically, the present invention relates to methods for preparing chiral hemiesters from prochiral or meso cyclic acid anhydrides via desymmetrization, using bifunctional cinchona alkaloid catalysts comprising sulfonamide functional groups.
Enantioselective Alcoholysis of meso-Glutaric Anhydrides Catalyzed by Cinchona-Based Sulfonamide Catalysts
作者:Sang Eun Park、Eun Hye Nam、Hyeong Bin Jang、Joong Suk Oh、Surajit Some、Yong Seop Lee、Choong Eui Song
DOI:10.1002/adsc.201000289
日期:2010.9.10
The bifunctional Cinchona‐based sulfonamide catalysts showed the highest levels of enantioselectivity reported to date in the alcoholytic desymmetrization of meso‐glutaric anhydrides. Density functional theory (DFT) computational studies provide detailed insight into the observed sense of enantioselectivity. Moreover, detailed experimental studies and single crystal X‐ray analysis confirmed that these