Dehydrogenative cyclization of thioamides is an attractive approach for the synthesis of S-heterocycles. Reported herein is an electrochemical dehydrogenative cyclization reaction of N-benzyl thioamides in a flow electrolysis cell. The continuous-flow electrosynthesis has addressed the limitations associated with previously reported methods for the cyclization of alkylthioamides and provide a transition metal- and oxidizing reagent-free access to various functionalized 1,3-benzothiazines in good yields.
硫代酰胺的脱氢环化反应是合成 S-杂环的一种极具吸引力的方法。本文报告的是在流动电解池中进行 N-苄基
硫代酰胺的电
化学脱氢环化反应。连续流电合成解决了以前报道的烷基
硫代酰胺环化方法的局限性,并提供了一种无过渡
金属和氧化试剂的途径,以良好的产率获得各种官能化的 1,3-苯并
噻嗪。