aldimines took place smoothly in aqueous organic solvent to afford β-aminocarbonyl compounds in high yields. The HBF4-catalyzed Mannich-type reaction also proceeded smoothly in water without organic solvent in the presence of a surfactant. A three-component synthesis starting from aldehyde, amine, and silyl enolate was successfully realized by means of a Bronsted acid in aqueous media.
MgO nanoparticles were prepared by an improved sol–gel technique which appeared to have narrow size distributions. The synthesized magnesium oxide nanoparticles were used as an efficient catalyst in aza-Michael reaction for addition of amines to a series of α,β-unsaturated carbonyl compounds and nitro olefins under solvent-free conditions at room temperature to afford high yields of the β-amino carbonyl and β-nitro amines. The catalyst can be recovered and reused at least five successive runs without loss of activity.
Abstract A highlyefficientone-pot, three-component synthesis of β-aminoketones was demonstrated using the cost-effective, noncorrosive, and easily available Fe(O2CCF3)3 as a catalyst for the first time. The method can be employed to synthesize a wide range of target compounds and to introduce different functional groups into the β-aminoketone skeleton. Additionally, the method consistently has the
An efficient and mild bismuth triflate-catalysed three-component Mannich-type reaction
作者:Thierry Ollevier、Etienne Nadeau
DOI:10.1039/b710794c
日期:——
In the presence of a catalytic amount of Bi(OTf)(3).4H(2)O, aldehydes together with amines react with silylenolates to afford the corresponding Mannich-type adducts smoothly. A wide variety of silylenolates derived from ketones, as well as esters and thioesters, react rapidly to afford the beta-amino ketones or the beta-amino esters in high yields (up to 94%).
An environmentally benign protocol: catalyst-free Michael addition of aromatic amines to α,β-unsaturated ketones in glycerol
作者:Anguo Ying、Qunhui Zhang、Hongmin Li、Gangfeng Shen、Weizhong Gong、Mingju He
DOI:10.1007/s11164-012-0575-0
日期:2013.2
Glycerol was used as a reaction medium as well as promoter for aza-Michael addition of aromatic amines to electronic deficient α,β-unsaturated ketones. Various aromatic amines can react smoothly with chalcone, 2-cyclohexen-1-one, 2-cyclopenten-1-one, and ethyl vinyl ketone to achieve good to excellent yields in the absence of any catalyst.