Hypervalent iodine-mediated synthesis of benzoxazoles and benzimidazoles via an oxidative rearrangement
作者:Xiaohui Zhang、Ruofeng Huang、Jérôme Marrot、Vincent Coeffard、Yan Xiong
DOI:10.1016/j.tet.2014.11.066
日期:2015.1
was found to act as an efficient oxidant to trigger the [1,2]-aryl migration towards the formation of the desired heterocycles. Depending on the substitution pattern, the results revealed another mechanistic pathway through which benzisoxazoles or 1H-indazoles could be formed. The Beckmann-type rearrangement strategy was applied to the synthesis of benzimidazole-containing biorelevant targets such as
已经开发出贝克曼型重排邻羟基和邻氨基芳基NH酮亚胺,分别制备苯并恶唑和N- Ts苯并咪唑。通过使氨与相应的酮缩合,可以容易地制备酮亚胺衍生物,并且发现(二乙酰氧基碘)苯可作为有效的氧化剂来触发[1,2]-芳基向形成所需杂环的迁移。根据取代模式,结果揭示了另一种可能形成苯并异恶唑或1 H-吲唑的机理。Beckmann型重排策略用于合成含苯并咪唑的生物相关靶标,如氯咪唑和克立咪唑。