Chiral Sulfinamide/Achiral Sulfonic Acid Cocatalyzed Enantioselective Protonation of Enol Silanes
摘要:
The application of chiral sulfinamides and achiral sulfonic acids as a cocatalyst system for enantioselective protonation reactions is described. Structurally simple, easily accessible sulfinamides were found to Induce moderate-to-high ee's in the formation of 2-aryl-substituted cycloalkanones from the corresponding trimethylsilyl enol ethers.
Chiral Sulfinamide/Achiral Sulfonic Acid Cocatalyzed Enantioselective Protonation of Enol Silanes
作者:Elizabeth M. Beck、Alan M. Hyde、Eric N. Jacobsen
DOI:10.1021/ol201608a
日期:2011.8.19
The application of chiral sulfinamides and achiral sulfonic acids as a cocatalyst system for enantioselective protonation reactions is described. Structurally simple, easily accessible sulfinamides were found to Induce moderate-to-high ee's in the formation of 2-aryl-substituted cycloalkanones from the corresponding trimethylsilyl enol ethers.
Indium-Mediated Asymmetric Allylation of Acylhydrazones Using a Chiral Urea Catalyst
作者:Kian L. Tan、Eric N. Jacobsen
DOI:10.1002/anie.200603354
日期:2007.2.12
Asymmetric Cooperative Catalysis of Strong Brønsted Acid–Promoted Reactions Using Chiral Ureas
作者:Hao Xu、Stephan J. Zuend、Matthew G. Woll、Ye Tao、Eric N. Jacobsen
DOI:10.1126/science.1182826
日期:2010.2.19
transformations, but their highreactivity can render selectivity in competing pathways difficult to control. Here, we describe a strategy for inducing enantioselectivity in reactions of protio-iminium ions, wherein a chiral catalyst interacts with the highly reactive intermediate through a network of noncovalent interactions. This interaction leads to an attenuation of the reactivity of the iminium ion and