A simple and efficient Mn-catalyzed acylation of amines is achieved using both acyl and alkoxy functions of unactivated esters with the liberation of molecular hydrogen as a sole byproduct. The present protocol provides an atom-economical and sustainable route for the synthesis of amides from esters by employing an earth-abundant manganese salt and inexpensive phosphine-free tridentate ligand.
[figure: see text] Beckmann rearrangement of oxime is catalyzed by [RhCl(cod)]2, trifluoromethanesulfonic acid, and tris(p-tolyl)phosphine in refluxing dichloroethane, giving the corresponding amide in good yield. Product/acid ratios of 10:20 can be attained in the reaction of benzophenone oximes.
Simple RuCl3-Catalyzed Amide Synthesis from Alcohols and Amines
作者:Subhash Chandra Ghosh、Soon Hyeok Hong
DOI:10.1002/ejoc.201000362
日期:2010.8
3 , an N-heterocycliccarbene (NHC), and pyridine, was developed. Of the screened NHC precursors, a less bulky one gave better yields for modestly sterically hindered substrates. In a search for the true catalytic intermediates, Grubbs catalysts were found to be active for the amidation of alcohols under basic conditions, suggesting that an Ru complexsupported by an NHC ligand can catalyze the reaction
[EN] PROCESS OF FORMING AN AMIDE<br/>[FR] PROCÉDÉ DE FORMATION D'UN AMIDE
申请人:UNIV NANYANG TECH
公开号:WO2011034506A1
公开(公告)日:2011-03-24
A process is provided for the synthesis of an amide. A primary or secondary amine and a primary alcohol, with the amine and the alcohol being either moieties of different reactants or moieties of the same molecule, are contacted in the presence of a Ruthenium (II) catalyst. The Ruthenium (II) catalyst is free of a phosphine ligand. The process is also carried out in the absence of a phosphine. Providing the Ruthenium (II) catalyst includes providing an N-heterocyclic carbene.
Direct Amide Synthesis from Either Alcohols or Aldehydes with Amines: Activity of Ru(II) Hydride and Ru(0) Complexes
作者:Senthilkumar Muthaiah、Subhash Chandra Ghosh、Joo-Eun Jee、Cheng Chen、Jian Zhang、Soon Hyeok Hong
DOI:10.1021/jo100254g
日期:2010.5.7
An in situ generated catalyst from readily available RuH2(PPh3)4, an N-heterocycliccarbene (NHC) precursor, NaH, and acetonitrile was developed. The catalyst showed high activity for the amide synthesis directly from either alcohols or aldehydes with amines. When a mixture of an alcohol and an aldehyde was reacted with an amine, both of the corresponding amides were obtained with good yields. Homogeneous