Synthesis of Heteroarylated Polyfluorobiphenyls via Palladium-Catalyzed Sequential sp<sup>2</sup> C–H Bonds Functionalizations
作者:Tao Yan、Lu Chen、Christian Bruneau、Pierre H. Dixneuf、Henri Doucet
DOI:10.1021/jo400221x
日期:2013.4.19
allows the selective synthesis of the polyfluoroaryl-heteroarenes in moderate to high yields, without C–H bond functionalization of the polyfluorobenzene ring. In most cases, low loading of Pd(OAc)2 catalyst (0.5–1 mol %) was employed. Then, from these heteroarylated polyfluorobenzenes, the palladium-catalyzed C–H bond functionalization of the polyfluorobenzene ring allows the synthesis of heteroarylated
与溴多氟苯的C–H键相比,杂芳烃的C5–H键在钯催化的直接芳基化反应中具有更高的反应性,从而能够以中等至高收率选择性合成多氟芳基–杂芳烃,而无需多氟苯环的C–H键功能化。在大多数情况下,使用的是低载量的Pd(OAc)2催化剂(0.5-1 mol%)。然后,从这些杂芳基化多氟苯中,多氟苯环的钯催化CH键官能化可以合成杂芳基化多氟联苯。