Intermolecular hydroamination and hydroarylation reactions of alkenes in ionic liquids
作者:Alexandre A.M. Lapis、Brenno A. DaSilveira Neto、Jackson D. Scholten、Fabiane M. Nachtigall、Marcos N. Eberlin、Jairton Dupont
DOI:10.1016/j.tetlet.2006.07.073
日期:2006.9
hydroamination or hydroarylation reactions of norbornene and cyclohexadiene performed with catalytic amounts of Brönsted or Lewis acid in ionic liquids were found to provide higher selectivity and yields than those performed in classical organic solvents. The ionic liquid increases the acidity of the media and stabilizes ionic intermediates through the formation of supramolecular aggregates.
HI-Catalyzed Hydroamination and Hydroarylation of Alkenes
作者:Sven Doye、Klaudia Marcseková
DOI:10.1055/s-2006-958934
日期:2007.1
Aromatic amines react with alkenes in the presence of catalytic amounts of aqueous HI to give mixtures of the corresponding hydroamination and hydroarylation products. While the hydroamination reaction is the preferred pathway for aliphatic alkenes, the hydroarylation reaction becomes more important when styrenes are used as substrates. In general, the electronic properties of the alkene and the amine strongly influence the efficiency and the selectivity of the reaction.
Preparation of Aryl−Alkylamines via Electrophilic Amination of Functionalized Arylazo Tosylates with Alkylzinc Reagents
作者:Pradipta Sinha、Christiane C. Kofink、Paul Knochel
DOI:10.1021/ol061303m
日期:2006.8.1
[reaction: see text] A new electrophilicamination reaction of functionalized arylazo tosylates with alkylzinc halides or dialkylzinc reagents in THF leads to the corresponding hydrazines. A facile cleavage of the N-N bond is achieved using Raney nickel in refluxing ethanol, leading to substituted secondary aryl-alkylamines in 45-79% yield.
Proton-Catalyzed Hydroamination and Hydroarylation Reactions of Anilines and Alkenes: A Dramatic Effect of Counteranions on Reaction Efficiency
作者:Laura L. Anderson、John Arnold、Robert G. Bergman
DOI:10.1021/ja053700i
日期:2005.10.1
The anilinium salt, [PhNH3][B(C6F5)4], has been identified as a catalyst for the hydroamination and hydroarylation of several different types of alkenes with anilines. The weakly coordinating counterion of this acid plays a key role in this transformation. The reaction is facile for styrenes and tolerates norbornene, cyclic alkenes, and cyclohexadiene. Selectivity between hydroamination and hydroarylation products can be tuned using reaction time, temperature, and substrate substitution. Details regarding the substrate scope and selectivity of this hydroamination/hydroarylation reaction are discussed.
Intermolecular, Catalytic Asymmetric Hydroamination of Bicyclic Alkenes and Dienes in High Yield and Enantioselectivity
作者:Jianrong (Steve) Zhou、John F. Hartwig
DOI:10.1021/ja803523z
日期:2008.9.17
and to substituted cyclopentanes in nearly enantiopure form. Mechanistic studies show that addition of aniline-d2 occurs in a syn fashion and suggest that the catalytic cycle comprises oxidative addition of aniline to form a bis-anilide hydride complex, followed by migratory insertion of olefin and reductive elimination of product in a series of steps involving iridium complexescontaining ancillary