Internal Oxidant-Triggered Aerobic Oxygenation and Cyclization of Indoles under Copper Catalysis
作者:Huawen Huang、Jinhui Cai、Xiaochen Ji、Fuhong Xiao、Ya Chen、Guo-Jun Deng
DOI:10.1002/anie.201508076
日期:2016.1.4
A concise synthesis of pyrazolo[1,5‐a]indole derivatives by copper‐catalyzed aerobic oxygenation and cyclization of indoles with oxime acetates is described. This protocol represents an elegant example of N‐1, C‐2, and C‐3 tri‐functionalization of indoles in one‐pot. Mechanistic studies indicate the reaction proceeds through a radical procedure. Oximes as an internal oxidant have been demonstrated
描述了通过铜催化的需氧氧化和吲哚与乙酸肟的环化反应来简并合成吡唑并[1,5-a]吲哚衍生物。该协议代表了一锅中吲哚的N-1,C-2和C-3三官能化的一个很好的例子。机理研究表明,反应是通过基本过程进行的。肟作为一种内部氧化剂已被证明是引发有氧氧化的驱动力,即使在高原子经济和阶梯经济的情况下,肟也可为C-H功能化提供新的氧化方式。