Asymmetric Hydrogenation of α,β-Unsaturated Carboxylic Acids Catalyzed by Ruthenium(II) Complexes of Spirobifluorene Diphosphine (SFDP) Ligands
作者:Xu Cheng、Jian-Hua Xie、Sheng Li、Qi-Lin Zhou
DOI:10.1002/adsc.200606065
日期:2006.7
The ruthenium diacetate complexes ligated by chiral spirobifluorene diphosphines (SFDP) were very effective catalysts for the asymmetric hydrogenation of tiglic acid derivatives and α-methylcinnamic acid derivatives with high activities and excellent enantioselectivities (up to 98 % ee). The α-aryloxybutenoic acids can also be hydrogenated by these catalysts to provide the corresponding saturated α-aryloxybutanoic
Highly Efficient Asymmetric Hydrogenation of α,β-Unsaturated Carboxylic Acids Catalyzed by Ruthenium(II)-Dipyridylphosphine Complexes
作者:Liqin Qiu、Yue-Ming Li、Fuk Yee Kwong、Wing-Yiu Yu、Qing-Hua Fan、Albert S. C. Chan
DOI:10.1002/adsc.200600410
日期:2007.3.5
P-Phos and Xyl-P-Phos were applied in the asymmetrichydrogenation of α,β-unsaturatedcarboxylicacids. The cationic complexes [RuL(benzene)Cl]Cl were found to be superior to the corresponding neutral complex Ru(OCOCH3)2L in this type of reactions. The catalysts exhibited excellent activities and enantioselectivities (up to 97 % ee) in the asymmetrichydrogenation.
A highly efficient iridium-catalyzedhydrogenation of alpha,beta-unsaturated carboxylic acids has been developed by using chiral spiro-phosphino-oxazoline ligands, affording alpha-substituted chiral carboxylic acids in exceptionally high enantioselectivities and reactivities.
Process for producing optically active carboxylic acid
申请人:Takasago International Corporation
公开号:US05563295A1
公开(公告)日:1996-10-08
A process for the production of an optically active carboxylic acid (I), which comprises subjecting an olefinic carboxylic acid (II) to asymmetric hydrogenation using a complex as a catalyst consisting of an optically active phosphine (III) and a ruthenium compound. Complex of ##STR1## with a ruthenium compound ##STR2## According to the process of the present invention, optically active carboxylic acids can be produced with high yield.
[EN] METHOD FOR PRODUCING OPTICALLY ACTIVE CARBOXYLIC ACID<br/>[FR] METHODE SERVANT A PREPARER UN ACIDE CARBOXYLIQUE POSSEDANT UNE ACTIVITE OPTIQUE
申请人:TAKASAGO PERFUMERY CO LTD
公开号:WO2004087632A1
公开(公告)日:2004-10-14
A method for producing a desired optically active carboxylic acid with a high optical purity, wherein a complex catalyst used can be recovered and reused as an aqueous solution. The method contains the step of subjecting an α,β-unsaturated carboxylic acid in water or a mixed solvent of water and a water-insoluble organic solvent in the presence of a sulfonated BINAP-Ru complex represented by the formula [3]: [RuX(arene)(SO?3#191M)?2#191-BINAP}]X [3]wherein X represents a chlorine atom, a bromine atom or an iodine atom, arene represents a benzene or an alkyl-substituted benzene,M represents an alkaline metal atom, and BINAP represents 2,2'-bis(diphenylphosphine)-1,1'-binaphthyl to an asymmetric hydrogenation. The sulfonated BINAP-Ru complex can be recycled.