Bis-selenonium Cations as Bidentate Chalcogen Bond Donors in Catalysis
作者:Xinxin He、Xinyan Wang、Ying-Lung Steve Tse、Zhihai Ke、Ying-Yeung Yeung
DOI:10.1021/acscatal.1c03622
日期:2021.10.15
Lewisacids are frequently employed in catalysis but they often suffer from high moisture sensitivity. In many reactions, catalysts are deactivated because of the problem that strong Lewisacids also bond to the products. In this research, hydrolytically stable bidentateLewisacid catalysts derived from selenonium dicationic centers have been developed. The bis-selenonium catalysts are employed in
A New Cationic, Chiral Catalyst for Highly Enantioselective Diels−Alder Reactions
作者:Kevin T. Sprott、E. J. Corey
DOI:10.1021/ol034706k
日期:2003.7.1
[reaction: see text] The Diels-Alder reaction of cyclopentadiene and 2-methacrolein is catalyzed by a chiral Lewis acid to form the exo adduct in 96% yield and 96% ee.