N'-dioxide-Sc(III) complex catalysts. The BV oxidations of prochiral cyclohexanones and cyclobutanones afforded series of optically active ε- and γ-lactones, respectively, in up to 99% yield and 95% ee. Meanwhile, the kinetic resolution of racemic 2-arylcyclohexanones was also realized via an abnormal BV oxidation. Enantioenriched 3-aryloxepan-2-ones, whose formation is counter to the migratoryaptitude, were
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.
Enantioselective Protonation of Silyl Enol Ethers Catalyzed by a Chiral Pentacarboxycyclopentadiene-Based Brønsted Acid
作者:Jun Li、Shaoyu An、Chao Yuan、Pingfan Li
DOI:10.1055/s-0037-1611849
日期:2019.7
The enantioselectiveprotonation of silyl enol ethers was realized in the presence of a pentacarboxycyclopenta-1,3-diene-based chiral Bronsted acid catalyst with water as an achiral proton source to give the corresponding α-aryl ketones in good yields and up to 75% ee.
Correction to Enantioselective Baeyer–Villiger Oxidation: Desymmetrization of Meso Cyclic Ketones and Kinetic Resolution of Racemic 2-Arylcyclohexanones
[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.