The reactivity of 8-iodoimidazo[1,2-a]pyridine towards copper- and palladium-catalyzed aminations is reported. The copper-based methodology led to the attempted coupling products in only poor yields due to difficult purifications. On the contrary, good coupling yields were obtained using palladium-catalyzed amination protocols. The superiority of Pd2dba3 was demonstrated over Pd(OAc)2.
报告了 8-
碘咪唑并[1,2-a]吡啶对
铜催化和
钯催化胺化的反应性。由于难以纯化,
铜催化法只能获得产量较低的偶联产物。相反,使用
钯催化的胺化方案则获得了较高的偶联产率。结果表明,Pd2dba3 比 Pd(OAc)2 更优越。