Heck reaction catalysed by palladium supported with an electron-rich benzimidazolylidene generated in situ: remarkable ligand electronic effects and controllable mono- and di-arylation
作者:Gang Zou、Wen Huang、Yuanjing Xiao、Jie Tang
DOI:10.1039/b601833e
日期:——
The Heckreactions of arylbromides and chlorides are efficiently catalysed by palladium supported with benzimidazolylidenes generated in situ from N,N-dialkylbenzimidazolium salts in molten tetrabutylammonium bromide (TBAB) as ionic liquid reaction medium. Remarkable electronic effects from the benzimidazoliums on the catalysis have been observed. Reaction of 4-chloroacetophone with butyl acrylate
New water-soluble palladium(II) iodide complexes derived from N-protonated or N-alkyl-1,3,5-triaza-7-phosphaadamantanes: Synthesis, crystal structure and catalytic properties in aqua media
salts [PTA-R]I (R = H, Me, Et, nPr, nBu) give the water-soluble palladium(II) complexes of type [PdI3(PTA-R)] in isolated yields of 62–81%. All these compounds have been fully characterized by IR and NMR spectroscopies and elemental analyses. Their molecular structures were confirmed by single crystal X-ray diffraction analysis. The complexes belong to the relatively unusual zwitterionic, coordination
Palladium complexes with hydrophosphorane ligands (HP∼O and HP∼N), catalysts for Heck cross-coupling reactions
作者:Anna Skarżyńska、Anna M. Trzeciak、Miłosz Siczek
DOI:10.1016/j.ica.2010.09.014
日期:2011.1
ESI-MS spectroscopic methods. The relative stereochemistry of 1 and 3 was unambiguously determined by single X-ray diffraction studies. It was proved that complexes 1–3, and complex [PdCl2P(OCH2CMe2NH)OCH2CMe2NH2] (4) previously described in the literature, are very efficient catalysts for the Heck cross-coupling of bromobenzene with n-butyl acrylate. Moreover, they were also found to be effective catalysts
Palladium-catalyzed double arylations of terminal olefins in acetic acid
作者:Daichao Xu、Chunxin Lu、Wanzhi Chen
DOI:10.1016/j.tet.2011.12.017
日期:2012.2
A palladium-catalyzed Heck diarylation of terminalolefins under ligand-free conditions in acetic acid is described. This procedure allows double arylation of terminalolefins affording trisubstituted olefins in good to excellent yields. The methodology is applicable to the coupling of both electron-deficient and electron-rich aryl iodides leading to symmetrical and unsymmetrical β,β-diarylated alkenes
Palladium-Catalyzed, Ligand-Controlled Chemoselective Oxidative Coupling Reactions of Benzene Derivatives with Acrylamides under an Oxygen Atmosphere
作者:Seiichiro Harada、Hiroki Yano、Yasushi Obora
DOI:10.1002/cctc.201200649
日期:2013.1
Under an oxygen umbrella: The Pd‐catalyzed aerobic oxidativecoupling of benzenederivatives with acrylates provides an efficient and atom‐economical route to cinnamamides (see scheme). Readily available starting materials are used and molecular oxygen serves as the sole oxidant. By using this system, the chemoselectiveoxidativecouplingreaction can provide either monoarylation or diarylation products