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
Highly Efficient, Recyclable Pd(II) Catalysts with Bisimidazole Ligands for the Heck Reaction in Ionic Liquids
作者:Soon Bong Park、Howard Alper
DOI:10.1021/ol030071d
日期:2003.9.1
[reaction: see text] New Pd(II) complexes with bisimidazole ligands were prepared and proved to be effective catalysts for the Heckreaction under phosphine-free conditions using ionicliquids as solvents. This system could be recycled five times without any loss of catalytic activity.
Mizoroki–Heck Cross‐Coupling of Acrylate Derivatives with Aryl Halides Catalyzed by Palladate Pre‐Catalysts
作者:Mohammad Shahidul Islam、Fady Nahra、Nikolaos V. Tzouras、Assem Barakat、Catherine S. J Cazin、Steven P. Nolan、Abdullah Mohammed Al‐Majid
DOI:10.1002/ejic.201901075
日期:2019.11.24
involving aryl halides with various acrylates and acrylamides has been studied using air and moisture‐stable imidazolium‐based palladate pre‐catalysts. These pre‐catalysts can be converted into Pd‐NHC species (NHC = N‐heterocyclic carbene) under catalytic conditions and are capable of facilitating the Mizoroki–Heck reaction of aryl halides with various acrylates. The effects of solvent, catalyst loading
Triaryl phosphine-functionalized N-heterocyclic carbene ligands for Heck reaction
作者:Ai-E Wang、Jian-Hua Xie、Li-Xin Wang、Qi-Lin Zhou
DOI:10.1016/j.tet.2004.10.049
日期:2005.1
A new type of triaryl phosphine-functionalized imidazolium salts 6 were prepared. Their palladium complexes, generated in situ, were successfully applied in the palladium-catalyzed Heck reaction. Using 1 mol% of Pd(dba)(2) and 10 mol% 6c in the presence of 2 equiv of K2CO3 in DMAc has proven to be highly efficient for the coupling of a wide array of aryl bromides and iodides with acrylates in excellent yield. The coupling of 4-bromotoluene with various styrene derivatives catalyzed by Pd/6c complex also gave good results. (C) 2004 Elsevier Ltd. All rights reserved.
Heck reaction of β-substituted acrylates in ionic liquids catalyzed by a Pd-benzothiazole carbene complex
作者:Vincenzo Calò、Angelo Nacci、Antonio Monopoli、Luigi Lopez、Anna di Cosmo
DOI:10.1016/s0040-4020(01)00528-2
日期:2001.7
A Pd-catalyst with benzothiazole carbene as ligands allows, in tetrabutylammonium bromide melt as solvent, very fast and efficient reactions of haloaromatics with beta -substituted acrylates. (C) 2001 Elsevier Science Ltd. All rights reserved.