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。
From Byproducts to Efficient Fluorophores: A Route to the Synthesis of Fluorubines
was confirmed as a novel fluorubine derivative. In continuing our studies to substituted oligoazaacenes, we developed several synthetic entries to build up novel fluorubine derivatives, in which particularly aminobridged bis(quinoxaline)s are the key products for cationic hexaazapentacenes. We would like to discuss the possible formation pathways of these fluorubine derivatives, which exhibit interesting