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 Alcohols and Amines by Phosphine-Free Ruthenium Catalyst Systems
作者:Subhash Chandra Ghosh、Senthilkumar Muthaiah、Yao Zhang、Xiangya Xu、Soon Hyeok Hong
DOI:10.1002/adsc.200900482
日期:2009.11
synthesized directly fromalcohols and amines in high yields using an in situ generated catalystfrom easily available ruthenium complexes such as the (p-cymene)ruthenium dichloride dimer, [Ru(p-cymeme)Cl2]2, or the (benzene)ruthenium dichloride dimer, [Ru(benzene)Cl2]2, an N-heterocyclic carbene (NHC) ligand, and a nitrogen containing L-type ligand such as acetonitrile. The phosphine-free catalyst systems showed
PROCESS FOR PREPARING AMIDES FROM ALCOHOLS AND AMINES
申请人:MILSTEIN David
公开号:US20090112005A1
公开(公告)日:2009-04-30
The present invention provides a process for preparing amides, by reacting a primary amine and a primary alcohol in the presence of a Ruthenium catalyst, to generate the amide and molecular hydrogen. According to the process of the invention, primary amines are directly acylated by equimolar amounts of alcohols to produce amides and molecular hydrogen (the only byproduct) in high yields and high turnover numbers. This reaction is catalyzed by a Ruthenium complex, which is preferably based on a dearomatized PNN-type ligand of formula A1 or precursors thereof of formulae A2 or A3. Use of diamines in the reaction leads to bis-amides, whereas with a mixed primary/secondary amine substrate, chemoselective acylation of the primary amine group occurs.
USE OF RUTHENIUM COMPLEXES FOR FORMATION AND/OR HYDROGENATION OF AMIDES AND RELATED CARBOXYLIC ACID DERIVATIVES
申请人:Milstein David
公开号:US20120253042A1
公开(公告)日:2012-10-04
A process for preparing amides by reacting a primary amine and a primary alcohol in the presence of a Ruthenium complex to generate the amide and molecular hydrogen. Primary amines are directly acylated by equimolar amounts of alcohols to produce amides and molecular hydrogen (the only byproduct) in high yields and high turnover numbers. Also disclosed are processes for hydrogenation of amides to alcohols and amines; hydrogenation of organic carbonates to alcohols; hydrogenation of carbamates or urea derivatives to alcohols and amines; amidation of esters; acylation of alcohols using esters; coupling of alcohols with water and a base to form carboxylic acids; dehydrogenation of beta-amino alcohols to form pyrazines and cyclic dipeptides; and dehydrogenation of secondary alcohols to ketones. These reactions are catalyzed by a Ruthenium complex which is based on a dearomatized PNN-type ligand of formula A1 or precursors thereof of formulae A2 or A3.