enones present as s-trans conformers to provide good yields of the silyl enol ethers of beta-acetylido carbonyl compounds. Typically good substrates are 2-cyclopentenone, 2-cyclohexenone, alpha,beta-unsaturatedaldehydes, and beta-alkoxy-alpha-enones. Copper acetylide reagents prepared from CuI and an alkynyllithium give considerably higher yields than those prepared from CuBr or CuCN. Iodotrimethylsilane
Palladium-catalyzed 1,4-addition of terminal alkynes to unsaturated carbonyl compounds promoted by electron-rich ligands
作者:Lei Zhou、Liang Chen、Rachid Skouta、Huan-feng Jiang、Chao-Jun Li
DOI:10.1039/b805946m
日期:——
The efficient palladium-catalyzed conjugate addition of terminal alkynes to α,β-unsaturated carbonyl compounds has been developed using electron-rich ligands, producing the corresponding γ,δ-alkynyl ketone and γ,δ-alkynyl esters in good yields.
with alkyl acrylates proceeds in the presence of a catalytic amount of Ru3(CO)12 and lithium iodide to give the corresponding conjugate dienes. These two different types of catalytic carbon-carbon bondforming reactions are controlled only by the nature of halide ions, either a chloride or an iodide, with other conditions being kept almost the same.
Direct synthesis of indenes <i>via</i> a rhodium-catalyzed multicomponent C<sub>sp2</sub>–H annulation reaction
作者:Pierre Querard、Chao-Jun Li
DOI:10.1039/c8ob02359j
日期:——
catalyzed by a rhodium(III) complex and conducted under very mild conditions, making the overall process atom and step-economical. DFT mechanistic studies were performed to explore the mechanism of this reaction system.
The first palladium-catalyzed 1,4-addition of terminal alkynes to conjugated enones
作者:Liang Chen、Chao-Jun Li
DOI:10.1039/b407936a
日期:——
The first palladium-catalyzed 1,4-addition of terminalalkynes to conjugatedenones has been developed in water and in acetone, producing the corresponding gamma,delta-alkynyl ketones in high yields.