Zwitterion-Catalyzed Isomerization of Maleic to Fumaric Acid Diesters
作者:Ying-Pong Lam、Zachary Lam、Ying-Yeung Yeung
DOI:10.1021/acs.joc.0c02316
日期:2021.1.1
Fumaricacid diesters are important building blocks for organic synthesis. A class of zwitterionic organocatalysts based on an amide anion/iminium cation charge pair were found to be effective in catalyzing the isomerization of maleicacid diesters to give fumaricacid diesters. Comparison of the performance of different zwitterionic organocatalysts toward the reaction revealed that nonclassical hydrogen