Palladium-catalysed mono-α-alkenylation of ketones with alkenyl tosylates
作者:Yong Wu、Wai Chung Fu、Chien-Wei Chiang、Pui Ying Choy、Fuk Yee Kwong、Aiwen Lei
DOI:10.1039/c6cc08392g
日期:——
The first example of palladium-catalysed selective mono-[small alpha]-alkenylation of ketones with alkenyl tosylates is described. In the presence of Pd/XPhos catalyst system (0.1-1.0 mol%), the reaction provides mono--alkenylated of ketones in...
Ylide-Functionalized Phosphine (YPhos)–Palladium Catalysts: Selective Monoarylation of Alkyl Ketones with Aryl Chlorides
作者:Xiao-Qiang Hu、Dominik Lichte、Ilja Rodstein、Philip Weber、Ann-Katrin Seitz、Thorsten Scherpf、Viktoria H. Gessner、Lukas J. Gooßen
DOI:10.1021/acs.orglett.9b02830
日期:2019.9.20
phosphine (YPhos) ligands allow the palladium-catalyzed α-arylation of alkylketones with aryl chlorides with record setting activity. Using a cyclohexyl-substituted YPhos ligand, a wide range of challenging ketone substrates was efficiently and selectively monoarylated under mild conditions. A newly designed YPhos ligand bearing tert-butyl groups on the coordinating phosphorus atom is already active
Palladium-Catalyzed Synthesis of 2,1‘-Disubstituted Tetrahydrofurans from γ-Hydroxy Internal Alkenes. Evidence for Alkene Insertion into a Pd−O Bond and Stereochemical Scrambling via β-Hydride Elimination
作者:Michael B. Hay、John P. Wolfe
DOI:10.1021/ja054754v
日期:2005.11.30
diastereoselectivity in reactions of acyclic internal alkene substrates likely derives from a series of reversible β-hydride elimination and σ-bond rotation processes that occur following a rare intramolecular alkene syn-insertion into an intermediate Pd(Ar)(OR) complex. In addition, these studies shed light on the chemoselectivity of insertion, suggesting that the alkene inserts into the Pd−O bond in preference