Utilizing Native Directing Groups: Mechanistic Understanding of a Direct Arylation Leads to Formation of Tetracyclic Heterocycles via Tandem Intermolecular, Intramolecular C–H Activation
作者:Steven R. Wisniewski、Scott A. Savage、Evan O. Romero、Martin D. Eastgate、Yichen Tan、Eric M. Simmons、R. Erik Plata、John R. Sowa、Donna G. Blackmond
DOI:10.1021/acs.joc.9b00823
日期:2019.6.21
A mechanistic study on a direct arylation using a native picolylamine directing group is reported. Kinetic studies determined the concentration dependence of substrates and catalysts, as well as catalyst degradation, which led to the development of a new set of reaction conditions capable of affording a robust kinetic profile. During reaction optimization, a small impurity was observed, which was determined
报道了使用天然的甲基吡啶胺直接基团进行直接芳基化的机理研究。动力学研究确定了底物和催化剂的浓度依赖性,以及催化剂的降解,这导致了一套新的反应条件的开发,该条件能够提供强大的动力学特性。在反应优化过程中,观察到少量杂质,该杂质被确定为双重C–H活化产物。已发现第二组条件可以颠倒C–H活化的选择性,从而以高收率形成该四环。提出了一个分子间/分子内C–H活化途径的催化循环。