Rhodium catalyzed regioselective arene homologation of aryl urea via double C–H bond activation and migratory insertion of alkyne
作者:Yan Wang、Hao Zhou、Ke Xu、Mei-Hua Shen、Hua-Dong Xu
DOI:10.1016/j.cclet.2016.05.011
日期:2017.1
A convenient rhodium catalyzed oxidative arene homologation of aniline derivatives with symmetrical or unsymmetrical alkynes using Cu(OAc)2 as oxidant is described. Urea group is shown to be effective as a directing group for initial ortho C–H activation. Two migratory insertion events of alkyne into Rh–C bond occur successively, both with complete regioselectivity. This method is particularly useful
描述了使用Cu(OAc)2作为氧化剂的便捷的铑催化苯胺衍生物与对称或不对称炔烃的氧化芳烃同系物。尿素基团被证明是有效的初始邻氨基苯甲酸激活的指导基团。炔烃向Rh–C键的两个迁移插入事件相继发生,都具有完全的区域选择性。该方法对于合成具有不同取代基的聚芳烃特别有用,这在常规方案中尚未见报道。已经提出了一种机制来解释所观察到的数据。