The Michael reaction, with conjugate bases of β-diketones as donors and with α,β-unsaturatedketones as acceptors, is efficiently catalyzed by a combination of clay-supported nickel bromide (heterogeneous) and ferric chloride (homogeneous).
Synthesis of Biphenyl-Based Ligand: Application in Copper-Mediated Chemoselective Michael Reaction
作者:M. Shyam Sundar、Ashutosh V. Bedekar
DOI:10.1080/00397911.2014.946996
日期:2014.12.17
Abstract A biphenyl-based ligand attached was synthesized and screened in copper-mediated Michael reaction. The catalyst system works well with carbon or sulfur nucleophiles as Michael donors and cyclohexenone or chalcones as the acceptors under mild and neutral reaction conditions in a chemoselective manner. GRAPHICAL ABSTRACT
The LBAs (Lewis acid-assisted Brønsted acidcatalysis) is proposed as possible mechanistic process in the simple FeCl3-catalyzed Michael reactions of chalcones with active methylene compounds in organic solvents. And iron salts were found to be effective promoters in the asymmetricMichaeladdition of 4-hydroxycoumarin to α,β-unsaturated ketone, which resulted in excellent yield and high level of enantioselectivity
New Application of 1,4-Dihydropyridine System: Michael Reactions Mediated by 1,4-Dihydropyridine–Enolate Adduct in Micellar Medium
作者:Sabir H. Mashraqui、Madhavi A. Karnik
DOI:10.1246/cl.2003.1064
日期:2003.11
1,4-dihydropyridine-acetophenone enolate adduct, in catalytic amount effects Michael reactions in aqueous cationic micelles of cetyltrimethylammonium bromide. The enolate, generated by dissociation of the adduct abstracts a proton from readily enolizable substrates to bring about the Michael reaction under mild conditions in fair to good yields without side products.
Polyaniline-Anchored Metal Salts for Michael Reaction of <font>α</font>,<font>β</font>-Unsaturated Ketones
作者:Arun L. Patel、Harish R. Talele、H. S. Rama、Ashutosh V. Bedekar
DOI:10.1080/00397910802664277
日期:2009.7.29
Abstract A catalyst consisting of polyaniline-anchored metal salts is used as a Lewis acid to promote the Michaelreaction of α,β-unsaturated ketones. The reaction is performed efficiently with imidazole, acetyl acetone, and ethyl acetate as Michel donors and chalcones as the acceptors under ultrasound irradiation.