Several MOP ligands 5 containing aryl groups at 2′ position of (R)-2-(diphenylphosphino)-1,1′-binaphthyl skeleton were prepared and used for palladium-catalyzed asymmetric hydrosilylation of cyclic 1,3-dienes 6 with trichlorosilane. Highest enantioselectivity was observed in the reaction of 1,3-cyclopentadiene (6a) catalyzed by a palladiumcomplex (0.25 mol %) coordinated with (R)-2-(diphenylphosphino)-2′-(3
Preparation of a New MOP Ligand Containing a Long-Chain Alkyl Group and Its Use for Palladium-Catalyzed Asymmetric Hydrosilylation of Cyclic 1,3-Dienes
作者:Jin Wook Han、Tamio Hayashi
DOI:10.1246/cl.2001.976
日期:2001.10
A new MOP ligand containing n-octyl group at 6 and 6′ positions of (R)-2-(diphenylphosphino)-2′-aryl-1,1′-binaphthyl skeleton was prepared and used for palladium-catalyzed asymmetric hydrosilylation of cyclic 1,3-dienes with trichlorosilane. By introduction of the n-octyl group, the palladium-phosphine catalyst became soluble in the reaction system, realizing high catalytic activity at a low reaction
Enhanced catalytic activity in asymmetric hydrosilylation of 1,3-dienes with a soluble palladium catalyst
作者:Jin Wook Han、Tamio Hayashi
DOI:10.1016/s0957-4166(02)00094-0
日期:2002.3
A new MOP ligand 8 containing two it-octyl groups at the 6 and 6' positions of the (R)-2-(diphenylphosphino)-2'-aryl-1,1'-binaphthyl skeleton was prepared and used for the palladium-catalyzed asymmetric hydrosilylation of 1,3-dienes with trichlorosilane. The introduction of the n-octyl groups made the palladium-phosphine catalyst soluble in the reaction system, realizing high catalytic activity at a low reaction temperature. As a result, ligand 8 showed highest enantioselectivity for both cyclic and linear 1,3-dienes. (C) 2002 Elsevier Science Ltd. All rights reserved.
Catalytic asymmetric hydrosilylation of 1,3-dienes with new chiral ferrocenylphosphine-palladium complexes
作者:Tamio Hayashi、Yonetatsu Matsumoto、Ikutaro Morikawa、Yoshihiko Ito
DOI:10.1016/s0957-4166(00)82367-8
日期:——
Asymmetric hydrosilylation of cyclic 1,3-dienes catalyzed by an axially chiral monophosphine-palladium complex
Asymmetric hydrosilylation of cyclopentadiene and 1,3-cyclohexadiene with trichlorosilane in the presence of a palladium catalyst (0.1 mol %) bearing (R)-3-diphenylphosphino-3′-methoxy-4,4′-biphenanthryl[(R)-MOP-phen] gave a quantitative yield of the corresponding (R)-3-(trichlorosilyl)cycloalkenes of up to 80% ee. The allylation of benzaldehyde with the allylsilanes gave optically active homoallyl