The fast and efficient KI/H<sub>2</sub>O<sub>2</sub> mediated 2-sulfonylation of indoles and <i>N</i>-methylpyrrole in water
作者:Jun Zhang、Zhong Wang、Lingjuan Chen、Yan Liu、Ping Liu、Bin Dai
DOI:10.1039/c8ra09367a
日期:——
The rapid and efficient KI/H2O2-mediated 2-sulfonylation of substituted indoles and N-methylpyrrole was established. The corresponding 2-sulfonylation products are synthesizedfrom readily available sulfur sources, namely arylsulfonyl hydrazides, 4-methylbenzenesulfinic acid and sodium 4-methylbenzenesulfinate in good to excellent yields in only 5 min. Moreover, the aqueous solution of hydrogen peroxide
建立了快速高效的KI/H 2 O 2介导的取代吲哚和N-甲基吡咯的2-磺酰化反应。相应的 2-磺酰化产物是由容易获得的硫源,即芳基磺酰肼、4-甲基苯亚磺酸和 4-甲基苯亚磺酸钠在 5 分钟内以良好至优异的产率合成的。此外,过氧化氢水溶液既用作氧化剂又用作溶剂。机理研究表明,2,3-二碘二氢吲哚是主要的磺酰化中间体。
A Sulfonylation Reaction: Direct Synthesis of 2-Sulfonylindoles from Sulfonyl Hydrazides and Indoles
作者:Pranjit Barman、Rajjakfur Rahaman
DOI:10.1055/s-0036-1588398
日期:——
novel TBHP/I2-mediated coupling of C3/unsubstituted indoles with sulfonyl hydrazides. The reaction utilizes readily available starting materials under mild reaction conditions, providing an alternative and attractive approach to 2-sulfonylindoles with high yields. The developed synthetic procedure is suitable for both N-protected or unprotected indoles.
通过 TBHP/I2 介导的 C3/未取代吲哚与磺酰肼的新型偶联,开发了 2-磺酰吲哚衍生物的无金属合成。该反应在温和的反应条件下使用容易获得的原料,为高产率的 2-磺酰吲哚提供了一种替代且有吸引力的方法。开发的合成程序适用于 N 保护或未保护的吲哚。
Electrooxidative Metal-Free Dehydrogenative α-Sulfonylation of 1<i>H</i>-Indole with Sodium Sulfinates
underwent this sulfonylation smoothly at room temperature under metal-free and chemical-oxidant-free conditions to afford indolyl arylsulfones in good to high yields. This reaction was found to tolerate a variety of functional groups, including halides and cyclopropyl, ether, ester, and aldehyde groups. It was applied to the synthesis of biologically active 5-HT6 modulators.
Iodine-Catalyzed Regioselective 2-Sulfonylation of Indoles with Sodium Sulfinates
作者:Fuhong Xiao、Hui Chen、Hao Xie、Shuqing Chen、Luo Yang、Guo-Jun Deng
DOI:10.1021/ol402987u
日期:2014.1.3
Iodine-catalyzed selective 2-arylsulfonyl indole formation from indoles and sodiumsulfinates is disclosed. Various substituted 2-arylsulfonyl indoles were obtained in one pot in the absence of metal catalyst at room temperature under air.
Exploring a potential catalyst system for catalyst‐controlled selectivity in C−Sbondformation is a fascinating challenge. Herein, we described two novel and highlyefficient methods for the selectivesynthesis of C2‐ and C3‐sulfonylindoles showing good biological activities by employing iodide and copper catalysts, respectively. Mechanistic studies point to the crucial role of the electronic properties