3-芳基苯并[ d ]异恶唑的钯催化氧化均偶联和羟基化反应是通过使用苯并异恶唑作为新的导向基团通过直接的C(sp 2)-H键活化而开发的。该协议以高收率提供了功能化的,合成上有用的苯并异恶唑的不同方法。至关重要的是,1-碘-4-甲氧基苯起氧化剂的作用,介导脱氢的均偶联作用并最小化交叉偶联。X射线晶体学证实了双核二聚体Palladacycle中间体,并在催化循环中用作活性催化物质。
Benzisoxazole core and benzoxazolopyrrolidine via HDDA-derived benzyne with PTIO/DMPO
作者:Yu Lei、Wenjing Zhu、Yajuan Zhang、Qiong Hu、Jie Dong、Yimin Hu
DOI:10.1016/j.cclet.2022.107778
日期:2023.4
This research described a simple and efficient pathway for the synthesis of benzisoxazoles from arynes and PTIO (2-phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl), C−C and C−O bonds were formed in a single step without catalyst under mild conditions. The unexpected cleavage of C−N bond contributed to the formation of isoxazolering, as indicated by DFT studies. Furthermore, we obtained the structure