TEMPO-Catalyzed Electrochemical C–H Thiolation: Synthesis of Benzothiazoles and Thiazolopyridines from Thioamides
作者:Xiang-Yang Qian、Shu-Qi Li、Jinshuai Song、Hai-Chao Xu
DOI:10.1021/acscatal.7b00426
日期:2017.4.7
Benzothiazoles and thiazolopyridines are widely prevalent in pharmaceuticals and organic materials. Herein, we report a metal- and reagent-free method for the uniform synthesis of benzothiazoles and thiazolopyridines through 2,2,6,6-tetramethylpiperidine-N-oxyl radical (TEMPO)-catalyzed electrolytic C–H thiolation. This dehydrogenative coupling process provides access to a host of benzothiazoles and
苯并噻唑和噻唑并吡啶在药物和有机材料中广泛流行。在这里,我们报告了一种无金属和无试剂的方法,该方法可通过2,2,6,6-四甲基哌啶-N-氧基自由基(TEMPO)催化的电解C–H硫醇化来均匀合成苯并噻唑和噻唑并吡啶。该脱氢偶联过程提供了从N-(杂)芳基硫代酰胺中获得大量苯并噻唑和噻唑并吡啶的途径。机理研究表明,硫酰胺底物通过内球电子转移被电化学生成的TEMPO +氧化,得到硫代酰胺基,该基团经过均相芳族取代形成关键的C–S键。