A low-cost electrochemical thio- and selenocyanation strategy for electron-rich arenes under catalyst- and oxidant-free conditions
作者:Xing Zhang、Chenguang Wang、Hong Jiang、Linhao Sun
DOI:10.1039/c8ra04407d
日期:——
A low-cost and efficient thio- and selenocyanation strategy for electron-rich arenes has been developed under constant-current electrolytic conditions in an undivided cell without the use of any catalyst or oxidant.
nanotubes (Ag/TNT) were synthesized via simple hydrothermal process, and this photocatalyst was successfully exploited in thiocyanation reactions at room temperature under visible light irradiation. Four classes of important heterocyclic compounds including indole, aniline, pyrrole and 2-amino thiazole derivatives via Ag/TNT treated with ammonium thiocyanate formed the corresponding thiocyano compounds
本研究通过简单的水热法合成了Ag / TiO 2纳米管(Ag / TNT),并在室温下可见光照射下成功地将该光催化剂用于硫氰化反应。四类重要的杂环化合物,包括吲哚,苯胺,吡咯和2-氨基噻唑衍生物通过用硫氰酸铵处理的Ag / TNT以中等至极好的收率形成了相应的硫氰基化合物。Ag纳米颗粒(主要沉积在TNT的表面)对包含硫原子的吸收物种的等离子特性和催化性能是反应进行的关键因素。首次报道的这种有效,简单和通用的方案在可见光下提供了苯胺,吡咯和2-氨基噻唑衍生物的硫氰化反应。通过应用空气分子氧作为低成本和环境友好的末端氧化剂,反应通过自由基途径进行。
Iodine/MeOH: a novel and efficient reagent system for thiocyanation of aromatics and heteroaromatics
Indoles, pyrroles, oxindoles and aromatic amino compounds undergo smooth thiocyanation with ammonium thiocyanate in the presence of molecular iodine in methanol under mild conditions to afford the corresponding 3-indolyl, 2-pyrrolyl and 4-aryl thiocyanates, respectively, in excellent yields with high selectivity. The reactions proceed rapidly at room temperature without heating or the use of strong
“Metal-free” electrooxidative C—H thiocyanation of arenes
作者:V. A. Kokorekin、E. I. Mel’nikova、R. R. Yaubasarova、N. V. Gorpinchenko、V. A. Petrosyan
DOI:10.1007/s11172-019-2681-2
日期:2019.11
5-trimethylpyrazolo[1,5-a]pyrimidine, we successfully used one of such materials, namely, glassy carbon (GC).6 For development of these studies, there was an undoubted practical interest in using GC electrodes for synthesis of a wider range of aryl thiocyanates that we carried out via electrooxidative С—Н thiocyanation of benzene, pyrrole, and pyrazolo[1,5-a]pyrimidine derivatives to yield products 1—15
Nonsteroidal compounds as anti-inflammatory and analgesic agents
申请人:Merck & Co., Inc.
公开号:US04434175A1
公开(公告)日:1984-02-28
5-Aroyl-4-RO-, 5-aroyl-4-RS-, 5-aroyl-4-RSO-, 5-aroyl-4-RSO.sub.2 -, or 5-pyrrylcarbonyl-pyrrole alkanoic acid have been prepared via hydrolysis of a precursor-ester after high temperature decarboxylation or from direct acidic decarboxylation of a precursor diacid. The compounds are analgesic and anti-inflammatory agents of high activities but low ulcerogenic side effects.