Palladium-catalyzed non-directed C–H bond arylation of difluorobenzenes and dichlorobenzenes bearing benzoxazole or benzothiazole
作者:Fatma Abdellaoui、Hamed Ben Ammar、Jean-François Soulé、Henri Doucet
DOI:10.1016/j.catcom.2015.07.025
日期:2015.11
We report, herein, on palladium-catalyzed direct arylation of difluorobenzenes and dichlorobenzenes bearing benzoxazole or benzothiazole moieties, which don't act as directing groups. With moderate electron-withdrawing substituents on the aryl bromides as coupling partners, the reaction proceeds nicely using phosphine-free PdCl2 catalyst, and potassium pivalate/dimethylacetamide (PivOK/DMA) as catalytic
在本文中,我们报道了钯催化带有苯并恶唑或苯并噻唑部分的二氟苯和二氯苯的直接芳基化,它们不充当引导基团。在芳基溴化物上具有适度的吸电子取代基作为偶联伙伴的情况下,使用无膦的PdCl 2催化剂和新戊酸钾/二甲基乙酰胺钾(PivOK / DMA)作为催化体系,反应可以顺利进行。该反应是区域选择性的,发生在氟或氯原子受阻较小的邻位。