By using2-(fluorosulfonyl)difluoroacetic acid as sulfur reagent, bisindole sulfanes were highly efficient synthesized under transition-metal-free conditions. Results indicate that this proceeded not at the relatively acidic C-2 position but rather selectively at the nucleophilic C-3 position to give the desired compounds with excellent regioselectivities and good yields.
Copper-Catalyzed CH Bond Direct Chalcogenation of Aromatic Compounds Leading to Diaryl Sulfides, Selenides, and Diselenides by Using Elemental Sulfur and Selenium as Chalcogen Sources Under Oxidative Conditions
oxidation conditions. The use of a polar solvent was crucial for the reaction, and DMSO (dimethyl sulfoxide) in particular stimulated the reaction. The reaction could be applied to common aromaticcompounds, such as N‐methyl indole and dialkyl anilines. The reaction of indole proceeded at the nucleophilic C3 position rather than at the acidic C2 position. In addition, the reaction of dialkyl anilines
进行了铜盐催化的芳香族化合物与元素硫属元素的反应,并以分子氧作为氧化剂。在CuTC(铜(I)噻吩羧酸盐)存在下,3-取代的咪唑并[1,5- a ]吡啶与元素硫的反应以良好的定量收率得到了相应的双咪唑并吡啶基硫化物。即使在有氧氧化条件下,反应也进行。极性溶剂的使用对于反应至关重要,尤其是DMSO(二甲基亚砜)会促进反应。该反应可应用于常见的芳族化合物,例如N-甲基吲哚和二烷基苯胺。吲哚的反应在亲核的C3位置进行,而不是在酸性的C2位置进行。另外,二烷基苯胺的反应以邻位,对位进行。咪唑并吡啶与元素硒在相似条件下的反应得到相应的双咪唑并吡啶二硒化物和双咪唑并吡啶单硒化物。在相同条件下,未反应的咪唑并吡啶易于将得到的二硒化物转化为相应的单硒化物。该反应可用于双官能双咪唑并吡啶和元素硫的共聚,以定量收率得到低聚物。
Synthesis and antioxidant activity of new C-3 sulfenyl indoles
作者:Claudio C. Silveira、Samuel R. Mendes、Josemar R. Soares、Francine N. Victoria、Débora M. Martinez、Lucielli Savegnago
DOI:10.1016/j.tetlet.2013.07.004
日期:2013.9
A convenient and efficient methodology for the synthesis of new C-3 sulfur-substituted indoles under CeCl3·7H2O promotion is reported. Modelbis(indol-3-yl)sulfide 4a and bis(indol-3-yl)sulfone 5a proved to display potent antioxidant activity at the low micromolar level, in DPPH, ABTS, and FRAP assays, as well as in the inhibition of the peroxidation of linoleic acid.
XtalFluor‐E Enabled Regioselective Synthesis of Di‐Indole Sulfides by C3−H Sulfenylation of Indoles
作者:Nojus Cironis、Kang Yuan、Stephen P. Thomas、Michael J. Ingleson
DOI:10.1002/ejoc.202101394
日期:2022.3.15
Xtalfluor-E reacts with amine bases to form Lewisadducts which when combined with indoles afforded a simple and regioselective synthesis of di-indole sulfides as well as di-indole diethyl amino sulfonium by electrophilic aromatic substitution (SEAr).