Facile nBu4 NF Mediated Benzylation Of Congested 1,3-Diketones
摘要:
Facile benzylation of 1,3-diketones is mediated by nBu(4)NF in THF-water. The reaction conditions are mild, the performance is simple, and the yields are high. Importantly, no O-alkylation side reactions or subsequent retro-Claisen C-C-bond cleavage are observed even in sterically congested systems.
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.
Silica gel-mediated catalyst-free and solvent-free Michael addition of 1,3-dicarbonyl compounds to highly toxic methyl vinyl ketone without volatilization
作者:Kiyoshi Tanemura、Taoufik Rohand
DOI:10.1016/j.tetlet.2020.152142
日期:2020.7
Silica gel-mediated Michaeladdition of 1,3-dicarbonyl compounds to methyl vinylketone (MVK) and ethyl vinylketone (EVK) was carried out to give the corresponding adducts in quite excellent yields. The reactions could be carried out without any catalysts and solvents. In addition, highly toxic MVK and EVK could be employed without significant volatilization. Silica gel could be recycled five times
Hydrogen-Bond-Promoted C-C Bond-Forming Reaction: Catalyst-Free Michael Addition Reactions in Ethanol
作者:Seiji Shirakawa、Shoichi Shimizu
DOI:10.1055/s-2007-992377
日期:——
A practical protocol for catalyst-free Michael addition reactions in ethanol was developed. The reaction was promoted efficiently in alcohol without any additives, and the importance of hydrogen-bonding activation was suggested.
Preparation of a microsized cerium chloride-based catalyst and its application in the Michael addition of β-diketones to vinyl ketones
作者:Alexander O. Terent'ev、Vera A. Vil'、Ivan A. Yaremenko、Oleg V. Bityukov、Dmitri O. Levitsky、Vladimir V. Chernyshev、Gennady I. Nikishin、Fabrice Fleury
DOI:10.1039/c3nj01454a
日期:——
evaporation of its alcoholic solutions. The way of the preparation of the cerium chloride-based catalyst plays a decisive role in its catalytic activity. This catalyst is efficient in the Michaeladdition of β-diketones to vinyl ketones giving β,δ-triketones.
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.