Enhanced catalytic activity in asymmetric hydrosilylation of 1,3-dienes with a soluble palladium catalyst
摘要:
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.
Enhanced catalytic activity in asymmetric hydrosilylation of 1,3-dienes with a soluble palladium catalyst
摘要:
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.
Preparation of New Ferrocenylmonophosphine Ligands Containing Two Planar Chiral Ferrocenyl Moieties and Their Use for Palladium-Catalyzed Asymmetric Hydrosilylation of 1,3-Dienes
Bisi(R-p)-2-[(1S)-1-methoxyethyl]ferrocenyl]arylphosphines (S,R-p)-9 (aryl = 4-MeOC6H4 (9a), Ph (9b), 4-CF3C6H4 (9c), 3,5-(CF3)(2)C6H3 (9d)), which contain two planar chiral ferrocenyl moieties, were prepared via (R-p)-1-bromo-2-[(1S)-1-methoxyethyl]ferrocene ((S,R-p)-8). Asymmetric hydrosilylation of linear 1,3-dienes such as deca-1,3-diene (10a) with trichlorosilane in the presence of a palladium catalyst coordinated with 9d gave allylic silanes of up to 93% ee.
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.