Reactivity of C–H bonds of polychlorobenzenes for palladium-catalysed direct arylations with aryl bromides
作者:Liqin Zhao、Tao Yan、Christian Bruneau、Henri Doucet
DOI:10.1039/c3cy00757j
日期:——
The reactivity of polychlorobenzenes vs. polyfluorobenzenes for palladium-catalysed direct arylation was studied. The PdCl(C3H5)(dppb)/KOAc system was found to promote the direct arylation of some polychlorobenzenes with aryl bromides. However, the reactivity of polychlorobenzenes was found to be lower than that of polyfluorobenzenes. The best yields were obtained from the coupling of 1,2,4,5-tetrachlorobenzene or 1,3,5-trichlorobenzene with electron-deficient aryl bromides. The C3 arylation of 2,5-dichlorothiophene was also found to proceed nicely.
研究了多氯苯与多氟苯在钯催化直接芳基化反应中的反应性。发现PdCl(C3H5)(dppb)/KOAc体系能够促进一些多氯苯与芳基溴化物的直接芳基化。然而,多氯苯的反应性低于多氟苯。最佳的产率来自于1,2,4,5-四氯苯或1,3,5-三氯苯与缺电子芳基溴化物的偶联反应。同时,2,5-二氯噻吩的C3芳基化反应也表现良好。