Palladium-Catalyzed Direct Arylation of Electron-Deficient Polyfluoroarenes with Arylboronic Acids
作者:Ye Wei、Jian Kan、Min Wang、Weiping Su、Maochun Hong
DOI:10.1021/ol901200g
日期:2009.8.6
The palladium-catalyzeddirectarylation of electron-deficient arenes that contain two or more fluorine groups with arylboronic acids was realized. The key to achieving a broad substrate scope with respect to both polyfluorobenzenes and arylboronic acids is the choice of bases depending on acidities of polyfluorobenzenes.
The reactivity of electron-deficient arene gold(III) complexes toward nucleophilic aromatic and heteraromatic counterparts has been studied. 1-Methylindole proved to be the best reaction partner while trimethoxybenzenes did not react. The ancillary ligand on gold also influenced the reactivity in the order PPh3>(PBu3)-Bu-t>IPr. An oxidative cross-coupling starting from the corresponding gold(I) complexes in presence of hypervalent iodide oxidants was also studied. (C) 2013 Elsevier Ltd. All rights reserved.