A metal-free synthesis of bifunctionalized indole derivatives was developed through a novel TBHP/TBAI-mediated oxidative coupling of C2,C3-unsubstituted indoles with arylsulfonyl hydrazide. Under the same conditions C3-methyl substituted indoles underwent a diazotization process, affording 2-sulfonyldiazenyl-1H-indoles. The former reaction simultaneously established C–S and C–N bonds through selective sulfonylation and diazotization of the indole framework, enabling a mild and practical access to polyfunctionalized indoles with good to excellent yields.
开发了一种无
金属的合成方法,通过新颖的
TBHP/TBAI介导的氧化偶联反应,将C2、C3未取代的
吲哚与芳基磺酰
肼反应,合成了双官能团化的
吲哚衍
生物。在相同条件下,C3-甲基取代的
吲哚经历了重氮化过程,获得了2-磺酰基重氮基-1H-
吲哚。前述反应通过对
吲哚框架的选择性磺酰化和重氮化同时建立了C–S和C–N键,提供了一种温和且实用的方法,以良好至优异的产率获得多官能团化的
吲哚化合物。