Synthesis of<i>ortho</i>-(Fluoro)alkylated Pyridines<i>via</i>Visible Light-Promoted Radical Isocyanide Insertion
作者:Kun Tong、Tianyi Zheng、Yan Zhang、Shouyun Yu
DOI:10.1002/adsc.201500674
日期:2015.11.16
A regiospecific synthesis of ortho-trifluoromethylated and ortho-(fluoro)alkylated pyridine derivatives has been developed. This strategy is enabled by visible light-promoted vinyl isocyanide insertions with Umemoto’s reagent and electron-deficient bromides at room temperature. The methodology presented here provides an access to highly functionalized ortho-(fluoro)alkylated pyridine derivatives regiospecifically
已经开发了邻三氟甲基化和邻(氟)烷基化吡啶衍生物的区域特异性合成。通过在室温下用梅香试剂和缺电子的溴化物在可见光促进下插入乙烯基异氰化物,可以实现此策略。本文介绍的方法提供了在温和条件下以良好收率对区域高度特异性的高官能化邻-(氟)烷基化吡啶衍生物进行制备的途径。TEMPO捕获实验,Stern-Volmer分析以及起/熄灯和时间曲线实验为该机制提供了支持。