Synthesis of Indazoles and Azaindazoles by Intramolecular Aerobic Oxidative CN Coupling under Transition-Metal-Free Conditions
作者:Jiantao Hu、Huacheng Xu、Pengju Nie、Xiaobo Xie、Zongxiu Nie、Yu Rao
DOI:10.1002/chem.201304923
日期:2014.4.1
A transition‐metal‐free oxidative CN coupling method has been developed for the synthesis of 1H‐azaindazoles and 1H‐indazoles from easily accessible hydrazones. The procedure uses TEMPO, a basic additive, and dioxygen gas as the terminal oxidant. This reaction demonstrates better reactivity, functional group tolerance, and broader scope than comparable metal catalyzed reactions.
过渡金属-自由氧化Ç N个耦合方法已为1的合成开发ħ -azaindazoles 1个ħ从容易获得腙-indazoles。该程序使用TEMPO(一种碱性添加剂)和双氧气体作为终端氧化剂。与可比的金属催化反应相比,该反应显示出更好的反应性,官能团耐受性和更宽的范围。