2,3-二甲基-1,3-丁二烯 、 富马酸二甲酯 在
乙醚 作用下,
以
甲苯 为溶剂,
反应 24.0h,
以to give the title compound in 85%的产率得到dimethyl (4R,5R)-1,2-dimethylcyclohexene-4,5-dicarboxylate
Enantioselective Diels-Alder Reactions of Carboxylic Ester Dienophiles Catalysed by Titanium-Based Chiral Lewis Acid
作者:Yogesh Choughule、Anand Patwardhan
DOI:10.13005/ojc/320217
日期:2016.4.28
A new titanium-based chiralLewisacid 1 has been developed using (1R,2R)-1,2-bis-(2methoxyphenyl)-ethane-1,2-diol as a chiral vicinal diol ligand. This chiral catalyst was found to exhibit uniformly high enantioselectivity towards carboxylic ester dienophiles in Diels-Alder reactions. The chiral vicinal ligand (1R,2R)-1,2-bis-(2-methoxyphenyl)-ethane-1,2-diol is inexpensive and is easily accessible