AbstractWe report herein a synthesis of quinoxalin‐2(1H)‐ones from 3‐hydroxyindolin‐2‐one derivatives, which can be synthesized from commercially available isatins in one or two steps. The reaction proceeded through a CF3CO2H‐mediated azidation via a carbocation, followed by acid‐induced N2 extrusion and ring‐expansion. Both CF3CO2H and the solvent 1,1,1,3,3,3‐hexafluoro‐2‐propanol were found to be crucial for this rearrangement. The axial chirality in 3‐hydroxyindolin‐2‐one skeleton was fully preserved in the products.
摘要 我们在此报告了一种从 3-羟基吲哚啉-2-酮衍生物合成喹喔啉-2(1H)-酮的方法。该反应是通过一个碳位化合物在 CF3CO2H 介导下发生叠氮反应,然后在酸的诱导下发生 N2 挤压和扩环反应。研究发现,CF3CO2H 和溶剂 1,1,1,3,3,3-六氟-2-丙醇对这一重排反应至关重要。产物中完全保留了 3-hydroxyindolin-2-one 骨架的轴向手性。