Synthesis of 1,3-benzothiazines by intramolecular dehydrogenative C–S cross-coupling in a flow electrolysis cell
作者:Chong Huang、Hai-Chao Xu
DOI:10.1007/s11426-019-9554-1
日期:2019.11
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。