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
A facile and general method for regioselective C2 sulfonylation reaction of indoles mediated by iodine is described. The 2-sulfonylated products were obtained up to 96% yield under mild reaction conditions (room temperature, 2 h).
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。