Lewis acid-mediated selective C3-isothiocyanation of quinoxalin-2(1H)-ones using N-thiocyanatosaccharin as an isothiocyanate source under visible light conditions at room temperature is described. Under similar conditions with N-chlorosaccharin, the C3-chlorination of quinoxalin-2(1H)-ones achieved a 2 h time frame. Good to an excellent yield of products was obtained in both cases with broad functional
描述了在室温可见光条件下使用N-硫氰酸糖精作为异硫氰酸酯源对喹喔啉-2(1 H )-酮进行路易斯酸介导的选择性 C3-异硫氰化反应。在与N-氯糖精相似的条件下,喹喔啉-2(1 H )-酮的 C3 氯化达到了 2 小时的时间范围。在这两种情况下均获得了良好至优异的产物收率,且具有广泛的官能团耐受性。对照实验表明该反应通过自由基机制进行。本程序证明了其在克级反应中的适用性,并强调了异硫氰酸酯随后转化为代表性的硫脲衍生物,以及一种氯代衍生物转化为糖原磷酸化酶抑制剂。