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 chiral Lewis acid 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
使用(1R,2R)-1,2-双-(2-甲氧基苯基)-乙烷-1,2-二醇作为手性邻位二醇配体,开发了一种新的钛基手性路易斯酸1。发现该手性催化剂在Diels-Alder反应中对羧酸酯二亲物表现出均一的高对映选择性。手性邻位配体(1R,2R)-1,2-双-(2-甲氧基苯基)-乙烷-1,2-二醇价格低廉并且易于获得。关键词:手性路易斯酸,手性邻位配体,Diels-Alder反应,亲二烯体,羧酸酯。