Ytterbium triflate catalyzed Michael additions of β-ketoesters in water
作者:Erik Keller、Ben L. Feringa
DOI:10.1016/0040-4039(96)00141-4
日期:1996.3
Michaeladdition of various β-ketoesters towards enones and α,β-unsaturated aldehydes resulted in a quantitative conversion to the corresponding 1,4-adducts by performing the reactions in water in the presence of ytterbiumtriflate as a water-tolerant Lewis acid.
P-BEMP: A New Efficient and Commercially Available User-Friendly and Recyclable Heterogeneous Organocatalyst for the Michael Addition of 1,3-Dicarbonyl Compounds
Michaeladdition of 1,3-dicarbonyls with various Michael acceptors has been found to be catalyzed by commercially available, user-friendly and recyclable N-phenyl-tris(dimethylamino)iminophosphorane immobilized on polystyrene resin (P-BEMP). The reaction does not require anhydrous solvents or inert atmosphere and proceeds smoothly at room temperature leading to the corresponding adducts, which can
Neutral Lewis Bases as Activators of Molecular Sieves in the Conjugate Addition of 1,3-Dicarbonyl Compounds
作者:Arrigo Scettri、Rosaria Villano
DOI:10.1055/s-2005-861810
日期:——
The catalytic properties of 3 A molecular sieves in the promotion of Michael addition of 1,3-dicarbonyl compounds are significantly improved by activation with several neutral Lewisbases. Comparable efficiency can be observed under solvent-free conditions.
Iron catalyzed Michael addition: Chloroferrate ionic liquids as efficient catalysts under microwave conditions
作者:Maria Vasiloiu、Peter Gaertner、Katharina Bica
DOI:10.1007/s11426-012-4657-z
日期:2012.8
containing ionicliquid 1-butyl-3-methylimidazolium tetrachloroferrate ([C4mim]Cl/FeCl3; χ = 0.5) proved to be an efficient catalyst for the solvent-free metal catalyzed Michaeladdition of β-keto esters and enones. Due to the ionic structure of the catalyst, a significant acceleration of the reaction rate was observed under microwave conditions. Furthermore, recycling of the ionicliquid catalyst could
Merrifield Resin−C<sub>6</sub>H<sub>4</sub>CH<sub>2</sub>N<sub>3</sub>P(MeNCH<sub>2</sub>CH<sub>2</sub>)<sub>3</sub>N: An Efficient Reusable Catalyst for Room-Temperature 1,4-Addition Reactions and a More Convenient Synthesis of Its Precursor P(MeNCH<sub>2</sub>CH<sub>2</sub>)<sub>3</sub>N
作者:Reddy、John G. Verkade
DOI:10.1021/jo062505z
日期:2007.4.1
donors were efficiently catalyzed at room temperature by the title reusable Merrifield resin-supported catalyst. Advantages of this catalyst include a simple workup (filtration of the reaction mixture) and good to excellent product yields. We also report a substantially simplified synthesis of the commercially available strong nonionic base 1, a precursor to the title polymer-bound catalyst.