TEMPO-Mediated Cross-Dehydrogenative Coupling of Indoles and Imidazo[1,2-<i>a</i>]pyridines with Fluorinated Alcohols
作者:Dhananjay S. Nipate、Sonam Jaspal、Vikki N. Shinde、Krishnan Rangan、Anil Kumar
DOI:10.1021/acs.orglett.1c00031
日期:2021.2.19
A simple and highly efficient metal-free method has been developed for hydroxyfluoroalkylation of indoles and imidazo[1,2-a]pyridines via TEMPO-mediated C(sp3)–H and C(sp2)–H bond cross-dehydrogenative coupling of fluorinated alcohols and indoles. The protocol showed broad substrate scope, afforded good yields of hydroxyfluoroalkylated products, and was amenable for scale-up. Mechanistic investigation
已经开发了一种简单高效的无金属方法,用于通过TEMPO介导的C(sp 3)–H和C(sp 2)–H键交叉脱氢偶联将吲哚和咪唑并[1,2- a ]吡啶进行羟基氟烷基化氟化醇和吲哚。该方案显示出广泛的底物范围,提供了良好的羟基氟烷基化产物收率,并且适合规模扩大。机理研究表明该自由基途径的参与。