A cooperative Pd–Cu system for direct C–H bond arylation
作者:Mathieu Lesieur、Faïma Lazreg、Catherine S. J. Cazin
DOI:10.1039/c4cc03201b
日期:——
A dual metal system bearing NHCs has been developed for the challenging construction of C–C bonds from arenes and heteroarenes.
已开发出一种双金属系统,其中含有NHCs,用于从芳烃和杂环芳烃中挑战性地构建C-C键。
COPPER-CATALYZED C-H BOND ARYLATION
申请人:Daugulis Olafs
公开号:US20090076266A1
公开(公告)日:2009-03-19
The present invention is a one-step method for efficiently converting carbon-hydrogen bonds into carbon-carbon bonds using a combination of aryl halides, a substrate, and a copper salt as catalyst. This method allows faster introduction of complex molecular entities, a process that would otherwise require many more steps. This invention is particularly relevant for the organic synthesis of complex molecules such as, but not limited to, pharmacophores and explosives.
1′‐biphenyl]‐4‐ols were obtained from pentafluorobenzene at 150 °C due to a formal regioselective hydroxylation, whereas at lower temperatures the expected pentafluorobiphenyls were obtained. However, no C−F bondcleavage was observed with the other polyfluorobenzene derivatives. These arylation reactions were carried out with only 1 mol % Pd/C as the catalyst and KOAc as an inexpensive base. Therefore,
Palladium‐Catalyzed Carbon–Fluorine and Carbon–Hydrogen Bond Alumination of Fluoroarenes and Heteroarenes
作者:Wenyi Chen、Thomas N. Hooper、Jamues Ng、Andrew J. P. White、Mark R. Crimmin
DOI:10.1002/anie.201706378
日期:2017.10.2
complex was identified as a catalyst for the selective transformation of sp2C−F and sp2C−H bonds of fluoroarenes and heteroarenes to sp2C−Al bonds (19 examples, 1 mol % Pd loading). The carbon–fluorine bond functionalization reaction is highly selective for the formation of organoaluminium products in preference to hydrodefluorination products (selectivity=4.4:1 to 27:1). Evidence is presented for a tandem
Copper-Catalyzed Arylation and Alkenylation of Polyfluoroarene C−H Bonds
作者:Hien-Quang Do、Olafs Daugulis
DOI:10.1021/ja077862l
日期:2008.1.30
An efficient, copper-catalyzed method for the arylation, alkenylation, and benzylation of polyfluoroarenes has been developed. Arenes containing two or more fluorine substituents on the aromatic ring can be efficiently functionalized. The best results are obtained by using a combination of copper iodide catalyst, phenanthroline ligand, aryl bromide or aryl iodide coupling partner, and DMF or DMF/xylene mixed solvent.