Simple, Highly Active Palladium Catalysts for Ketone and Malonate Arylation: Dissecting the Importance of Chelation and Steric Hindrance
作者:Motoi Kawatsura、John F. Hartwig
DOI:10.1021/ja983378u
日期:1999.2.1
catalytic reaction rates. We initially tested the bisphosphine ligand DtBPF (1,1‘-bis-(di-tert-butylphosphino)ferrocene) for this palladium-catalyzed chemistry. This catalyst system led to fast reaction rates for reactions of aryl bromides with ketones, including roomtemperature chemistry in many cases. In some cases turnover numbers were 20 000. The catalyst also gave mild reactions with aryl chlorides
Palladium-Catalyzed Arylation of Malonates and Cyanoesters Using Sterically Hindered Trialkyl- and Ferrocenyldialkylphosphine Ligands
作者:Neil A. Beare、John F. Hartwig
DOI:10.1021/jo016226h
日期:2002.1.1
diethyl malonate, di-tert-butyl malonate, diethyl fluoromalonate, ethyl cyanoacetate, and ethyl phenylcyanoacetate. Although alkyl malonates and ethyl alkylcyanoacetates did not react with aryl halides using these catalysts, the same products were formed conveniently in one pot from diethylmalonate by cross-coupling of an aryl halide in the presence of excess base and subsequent alkylation.
Rh(I)-Catalyzed Cross-Coupling of α-Diazoesters with Arylsiloxanes
作者:Ying Xia、Zhen Liu、Sheng Feng、Fei Ye、Yan Zhang、Jianbo Wang
DOI:10.1021/acs.orglett.5b00052
日期:2015.2.20
An Rh(I)-catalyzed cross-coupling of diazoesters with arylsiloxanes has been successfully achieved. This transformation is a new method for the construction of the C(sp(3))C(sp(2)) bond, thus providing an alternative synthesis of a-aryl esters. Rh(I)carbene migratory insertion has been proposed to be involved in this coupling reaction. The reaction represents the first example of utilizing arylsiloxane as the coupling partner in the carbene-involved cross-coupling reactions.
CATALYST COMPOSITION FOR OLEFIN POLYMERIZATION AND APPLICATION OF SAME