synthesis of 2‐vinylanilines from the reaction of arylhydrazine hydrochlorides with alkenes and diethyl ketone via a rhodium‐catalyzed CHactivation is described. The oxidant‐free olefination reaction involves the in situ generation of an NNCR1R2 moiety as the oxidizingdirecting group thus providing an easy access to 2‐vinylanilines.
Palladium/Tetraphosphine Catalysed Heck Reaction with ortho-Substituted Aryl Bromides
作者:Marie Feuerstein、Henri Doucet、Maurice Santelli
DOI:10.1055/s-2001-18752
日期:——
The tetraphosphine cis,cis,cis-1,2,3,4-tetrakis(diphenylphosphinomethyl)cyclopentane associated to [PdCl(C3H5)]2 catalyses the Heck reaction of butyl acrylate with a wide range of sterically demanding aryl bromides, furnishing the addition product in high yields. Turnover numbers as high as 630-89 000 have been obtained using ortho-substituted aryl bromides and 43-2600 with di-ortho-substituted aryl bromides in the presence of this catalyst.
A novel ligand-free copper-catalyzed Mizoroki-Heck cross-coupling reaction of various aryl iodides with olefins has been developed. Both the solvent and the base were found to have a fundamental influence on the efficiency of the transformation in the presence of 10 mol% Cu2O, with DMF and tetramethylammonium bromide (TMAB) being the optimal solvent and base, respectively. As a result, a set of the
On water: catalyst-free chemoselective synthesis of highly functionalized tetrahydroquinazolines from 2-aminophenylacrylate
作者:Rakesh K. Saunthwal、Monika Patel、Rakesh K. Tiwari、Keykavous Parang、Akhilesh K. Verma
DOI:10.1039/c4gc02154a
日期:——
A green and catalyst free atom-ecomonic straightforward tandem approach for the synthesis of highlyfunctionalized tetrahydroquinazolines by the reaction of 2-aminophenylacrylate 1 with isothiocyanates 2 using water as an environmental friendly solvent is described.
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