Enantioselective Synthesis of Coumarins Catalyzed by a Bifunctional Amine-Thiourea Catalyst
作者:Yaojun Gao、Qiao Ren、Lei Wang、Jian Wang
DOI:10.1002/chem.201002202
日期:2010.11.22
Efficient excess: An efficient and facile enantioselective Michael addition reaction through hydrogen‐bonding catalysis for the synthesis of coumarin complexes has been developed (see scheme). A simple bifunctional amine–thiourea small molecule has been discovered to catalyze this process with high yields and high to excellent enantiomeric excesses.