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.
[EN] PALLADIUM-CATALYZED ASYMMETRIC (HETERO)ARYLATION AND VINYLATION OF KETONE ENOLATES TO PRODUCE TERTIARY STEREOCENTERS AT ALPHA(α)-POSITION<br/>[FR] (HÉTÉRO)ARYLATION ET VINYLATION ASYMÉTRIQUES D'ÉNOLATES DE CÉTONES CATALYSÉES AU PALLADIUM PERMETTANT DE PRODUIRE DES STÉRÉOCENTRES TERTIAIRES EN POSITION ALPHA(&Agr;)
申请人:NANAYNG TECHNOLOGICAL UNIVERSITY
公开号:WO2014109712A1
公开(公告)日:2014-07-17
The invention relates to new ligands that are used in a palladium source catalyst system and in palladium catalyzed method for asymmetric α-(hetero)arylation and a-vinylation of ketones. The invention further relates to a process for preparing an asymmetric α-(hetero)arylated or a-vinylated ketone which comprises reacting the tin enolate of the ketone in the presence of catalyst system comprising a ligand of the invention and palladium source. By means of the ligands and process of the invention a stereogenic center in position a of the ketone is established with high enantiomeric excess.
Arene CHO Hydrogen Bonding: A Stereocontrolling Tool in Palladium-Catalyzed Arylation and Vinylation of Ketones
作者:Zhiyan Huang、Li Hui Lim、Zuliang Chen、Yongxin Li、Feng Zhou、Haibin Su、Jianrong Steve Zhou
DOI:10.1002/anie.201300621
日期:2013.4.26
Weak is powerful: For the arylation of tin enolates, the palladium catalyst engages in weak CHOhydrogen bonds to control stereoselectivity (see scheme). Similar catalysts capable of NHOhydrogenbonding also works well.