在此,我们报告了一种在混合研磨机中对吲哚和咪唑并[1,2- a ]吡啶进行亲电C-H硫氰化的无溶剂且可持续的方法。在研磨条件下,使用市售且更便宜的前体N-氯代琥珀酰亚胺和 NaSCN的组合,原位生成N-硫氰酸琥珀酰亚胺 (NTS),从而促进吲哚和咪唑上的 C-3 选择性硫氰化反应[1,2- a ]吡啶类。以硅胶为固体反应介质合成了一系列含有富电子环和缺电子环的硫氰化产物,并获得了良好至优异的收率。使用选定的克级底物验证了反应的可扩展性。此外,我们探索了通过双C-H活化的机械化学串联C-C和C-S键形成反应,从而可以从未取代的吲哚中轻松获得C-2芳基和C-3硫氰酸根化合物。此外,当前的方法还证明了-SCN前体机械化学转化为-SCF 3和5-取代的硫基四唑。
Convenient thiocyanation of indoles in CeBr3/H2O2 system
作者:Zhibing Weng、Liang Wang
DOI:10.1016/j.tetlet.2022.154090
日期:2022.9
A convenient electrophilic thiocyanation of indoles in CeBr3/H2O2 system has been developed. In this reaction, CeBr3/H2O2 system generates reactive brominating species (RBS), which react with NH4SCN to deliver active SCN cations. The Br- can be further oxidized to Br+, thereby furnishing the catalytical cycle. The reaction conditions are mild, providing the corresponding products in good to excellent
Visible-light-induced aerobic thiocyanation of indoles using reusable TiO2/MoS2 nanocomposite photocatalyst
作者:Liang Wang、Cancan Wang、Wenjie Liu、Qun Chen、Mingyang He
DOI:10.1016/j.tetlet.2016.03.028
日期:2016.4
TiO2/MoS2 nanocomposite photocatalyst was prepared via simple one-step hydrothermal process. This nontoxic and inexpensive photocatalyst exhibited high activity toward the thiocyanation of indoles under visible light irradiation at room temperature. Simple work-up, good yields, as well as reusability of the catalyst are the major advantages of the present method. (C) 2016 Elsevier Ltd. All rights reserved.