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
Asymmetric Diels–Alder Reactions of an Acrylic Acid Derivative Using a Chiral Titanium Catalyst
作者:Koichi Narasaka、Hiroko Tanaka、Fumihiko Kanai
DOI:10.1246/bcsj.64.387
日期:1991.2
Asymmetric Diels–Alder reactions of an acrylic acid derivative using a catalytic amount of a chiraltitanium reagent were performed with several dienes. The titaniumcatalyst was prepared by the al...