Nickel-Catalyzed Straightforward and Regioselective C–H Alkenylation of Indoles with Alkenyl Bromides: Scope and Mechanistic Aspect
作者:Rahul A. Jagtap、C. P. Vinod、Benudhar Punji
DOI:10.1021/acscatal.8b04267
日期:2019.1.4
associated with hydroindolation and oxidative alkenylation. The reaction conceded the coupling of indole derivatives with various alkenyl bromides, such as aromatic and heteroaromatics, α- and β-substituted as well as exo- and endo-cyclic alkenyl compounds. An extensive mechanistic investigation, including controlled study, reactivity experiments, kinetics and labeling studies, and EPR and XPS analyses
吲哚和相关杂芳烃与烯基溴的镍催化区域选择性C–H键烯基化反应是在相对温和的条件下完成的。该方法允许使用空气稳定且定义明确的镍催化剂(bpy)NiBr 2来直接合成C-2烯基化的吲哚,从而解决了与氢化吲哚化和氧化烯基化有关的局限性。该反应使吲哚衍生物与各种烯基溴化物(如芳族和杂芳族化合物,α-和β-取代的以及exo-和endo)偶联。-环烯基化合物。广泛的机械研究,包括对照研究,反应性实验,动力学和标记研究,以及EPR和XPS分析,突出表明烯基化过程是通过单电子转移过程进行的,该过程包括烯基溴的奇数电子氧化加成。此外,烯基化反应是通过可能的Ni(I)/ Ni(III)途径进行的,该途径涉及吲哚的限速C-H镍化反应。