A rapid, and metal‐free approach for the synthesis of functionalized benzofurans 10 is illustrated by PhI 9 catalyzed cyclization of 2‐hydroxystilbenes 8. The 2‐hydroxystilbenes 8 were cyclized using 10 mol % PhI as a precatalyst, 2.0 equiv. of m‐CPBA as an oxidant and 2.4 equiv. of TFA as an additive at room temperature under ultrasonic irradiation condition. The functionalized benzofurans 10 were gained in good to excellent yields with shorter reaction times.

中文翻译：

---

超声波辅助碘代苯催化的高价碘催化（E）-2-羟基苯乙烯的环化反应生成苯并呋喃

对于官能化的苯并呋喃的合成中的快速，和不含金属的方法10是由是Phl示出9的2-羟基茋催化环化8。使用10 mol％的PhI作为2.0当量的前催化剂将2-羟基对苯二酚8环化。的米-CPBA作为氧化剂和2.4当量。室温下超声辐射条件下TFA作为添加剂的分析。以较短的反应时间以良好至优异的产率获得了官能化的苯并呋喃10。