A New Class of Easily Activated Palladium Precatalysts for Facile C−N Cross-Coupling Reactions and the Low Temperature Oxidative Addition of Aryl Chlorides
作者:Mark R. Biscoe、Brett P. Fors、Stephen L. Buchwald
DOI:10.1021/ja801137k
日期:2008.5.1
one-component Pd precatalysts bearing biarylphosphine ligands is described. These precatalysts are air- and thermally stable, are easilyactivated under normal reaction conditions at or below room temperature, and ensure the formation of the highly active monoligated Pd(0) complex necessary for oxidative addition. The use of these precatalysts as a convenient source of LPd(0) in C-N cross-coupling reactions
Carbene adduct of cyclopalladated ferrocenylimine as an efficient catalyst for the amination of aryl chlorides
作者:Jingya Li、Mengjun Cui、Ajuan Yu、Yangjie Wu
DOI:10.1016/j.jorganchem.2007.05.022
日期:2007.8
A novel air- and moisture-stable carbene adduct of cyclopalladatedferrocenylimine has been synthesized and characterized. The structure of this compound was determined by X-ray crystal structure analysis. This adduct has been applied as an efficientcatalyst for the amination of aryl chlorides.
A Single-Step Synthesis of 4-Oxazolin-2-ones and Their Use in the Construction of Polycyclic Structures Bearing Quaternary Stereocenters
作者:Blanca M. Santoyo、Carlos González-Romero、Omar Merino、Rafael Martínez-Palou、Aydeé Fuentes-Benites、Hugo A. Jiménez-Vázquez、Francisco Delgado、Joaquín Tamariz
DOI:10.1002/ejoc.200900114
日期:2009.5
for the synthesis of 4-oxazolin-2-ones by a one-pot MW-promoted condensation of α-ketols and isocyanates is reported. An alternative thermal approach using the same starting materials is also described. These cyclic enamides were efficient nucleophiles, reacting with Michael acceptors and prenyl bromide to give a variety of polycyclicstructuresbearing one or two quaternarystereocenters. The selectivity
Triazole-Based Monophosphine Ligands for Palladium-Catalyzed Cross-Coupling Reactions of Aryl Chlorides
作者:Qian Dai、Wenzhong Gao、Duan Liu、Lea M. Kapes、Xumu Zhang
DOI:10.1021/jo060321e
日期:2006.5.1
readily available azides and acetylenes. Their palladium complexes provided excellent yields in the amination reactions and Suzuki−Miyaura coupling reactions of unactivated aryl chlorides. Ligand 7i, which has a 2,6-dimethoxybenzene moiety, provided good results in Suzuki−Miyaura reaction to form hindered biaryls. A CAChe model for the Pd/7i complex shows that the likelihood of a Pd−arene interaction
Phenylnitreniumions are generated from phenylhydrazines by treatment with AlCl3. Reaction of a phenylnitreniumion with arenes results in both aromaticN-substitution and C-substitution. In contrast, an N-methylphenylnitrenium ion undergoes exclusively aromatic C-substitution. Reaction of a phenylnitreniumion with arenes present only in slight excess produces anilinated products in moderate to good