Cu(acac)2 Immobilized in Ionic Liquids: A Recoverable and Reusable Catalytic System for Aza-Michael Reactions
作者:M. Lakshmi Kantam、V. Neeraja、B. Kavita、B. Neelima、Mihir K. Chaudhuri、Sahid Hussain
DOI:10.1002/adsc.200404361
日期:2005.5
Copper(II) acetylacetonate immobilized in ionicliquids efficiently catalyzes the aza-Michaelreaction of amines with α,β-unsaturated carbonyl compounds to produce the corresponding β-amino carbonyl compounds with great alacrity in excellent yields. The reactions are far more facile than those reported earlier. The recoveredionicliquid phase containing the copper catalyst can be reused for several cycles
very simple conjugate addition of aromatic and aliphatic amines to α,β-unsaturated carbonyl compounds under solvent-free conditions in the presence of catalytic amount of silicontetrachloride is reported. The reaction of aryl and alkyl amines with different Michael acceptors gave the corresponding Michael adducts with simple catalyst and good to excellent yields.
A new and convenient method for the acid-catalysed Michael addition reactions of alcohols, thiols and amines to methyl vinyl ketone has been developed using the ionic liquid ethyltri-n-butylphosphonium tosylate. The reaction conditions are mild and obviate the need for toxic and expensive Lewis acid catalysts, offering advantages over more commonly used systems.
Boric acid: a novel and safe catalyst for aza-Michael reactions in water
作者:Mihir K. Chaudhuri、Sahid Hussain、M. Lakshmi Kantam、B. Neelima
DOI:10.1016/j.tetlet.2005.09.167
日期:2005.11
Boric acid efficiently catalyzes the conjugate addition of aliphatic amines to alpha, beta-unsaturated compounds to produce beta-amino compounds, with great alacrity and excellent yields, in water under mild conditions. Aromatic amines do not participate effectively in the reaction. (c) 2005 Elsevier Ltd. All rights reserved.
Conjugate Addition of Amines to α,β-Enones Promoted by CeCl<sub>3</sub>·7H<sub>2</sub>O−NaI System Supported in Silica Gel