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
A novel method for synthesizing carbocyclic nucleosides was developed. The new synthesis includes a direct coupling reaction of cycloalkenylsilanes with a silylated nucleobase catalyzed by a hypervalent iodine reagent. By applying the method, a novel carbocyclic cytidine derivative having bis(hydroxymethyl)cyclohexene as a pseudosugar moiety, designed as a potential anti-HIV agent, was successfully
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
Palladium-Catalyzed Asymmetric Hydrosilylation of Cyclohexa-1,3-diene with Trichlorosilane by Use of Chiral Phosphoramidite Ligands from 3,3'-Disubstituted 1,1'-Binaphthols
作者:Hyun-Sub Park、Hye Mi Shin、Suk Namgung、Jin Wook Han
DOI:10.5012/bkcs.2014.35.9.2613
日期:2014.9.20
E-mail: jwhan@hanyang.ac.krReceived May 1, 2014, Accepted May 20, 2014Key Words : Asymmetric catalysis, Hydrosilylation, Palladium, Chiral phosphoramidites, AllylsilaneSince a breakthrough enhancing catalytic activity andenantioselectivity by use of axially chiral monophosphineligands (MOP) was reported in the hydrosilylation of 1-octene,
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.