A novelcatalyticsystem based on copper(I) and chiral bis(phosphine) dioxides is described. This allows the arylation of silyl enol ethers to access enolizable α-arylated ketones in good yields and enantiomeric excess up to 95%. Noncyclic ketones are amenable substrates with this method, which complements other approaches based on palladium catalysis. Optimization of the ligand structure is accomplished
The efficient RuPHOX–Ru catalyzed asymmetric hydrogenation of α-substituted tetralones via a dynamic kineticresolution has been achieved for the synthesis of chiral tetrahydronaphthols. The mechanism study indicated that hydrogenation with H2 gas, rather than transfer hydrogenation with EtOH solvent as the hydrogen source, predominates in the reaction pathway.
Asymmetric Catalytic Protonation of Silyl Enol Ethers with Chiral Palladium Complexes
作者:Masaharu Sugiura、Takeshi Nakai
DOI:10.1002/anie.199723661
日期:1997.11.14
[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.
NOVEL CHIRAL DIHYDROBENZOAZAPHOSPHOLE LIGANDS AND SYNTHESIS THEREOF
申请人:Boehringer Ingelheim International GmbH
公开号:US20180155377A1
公开(公告)日:2018-06-07
This invention relates to novel phosphorous ligands useful for organic transformations. Methods of making and using the ligands in organic synthesis are described. The invention also relates to processes for preparing the novel ligands.