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。
Rapid and efficient thiocyanation of phenols, indoles, and anilines in 1,1,1,3,3,3-hexafluoro-2-propanol under ultrasound irradiation
作者:Zhonghao Wang、Liang Wang、Qun Chen、Ming-yang He
DOI:10.1080/00397911.2017.1390139
日期:2018.1.2
ABSTRACT An efficient ultrasound-promoted thiocyanation of phenols, indoles, and anilines in the presence of N-chlorosuccinimide and NH4SCN using 1,1,1,3,3,3-hexafluoro-2-propanol as the solvent has been developed. The major features of the present protocol include the mild reaction conditions, short reaction times, good to excellent yields, and broad substrate scope. Moreover, scale-up synthesis can
Catalytic Thiourea Promoted Electrophilic Thiocyanation of Indoles and Aromatic Amines with NCS/NH<sub>4</sub>SCN
作者:Cancan Wang、Zhonghao Wang、Liang Wang、Qun Chen、Mingyang He
DOI:10.1002/cjoc.201600344
日期:2016.11
A simple and efficient protocol for the electrophilic thiocyanation of indoles and aromaticamines with thiourea/NCS/NH4SCN system has been developed. The major features of the present procedure are the mild conditions, good yields, short reaction times, and the use of inexpensive and readily available organocatalyst. Moreover, N‐chlorosuccinimide (NCS) was found to be indispensable, and thiourea could
Screening metal-free photocatalysts from isomorphic covalent organic frameworks for the C-3 functionalization of indoles
作者:Ziping Li、Songjie Han、Chunzhi Li、Pengpeng Shao、Hong Xia、He Li、Xiong Chen、Xiao Feng、Xiaoming Liu
DOI:10.1039/d0ta02164d
日期:——
An excellent framework photocatalyst was screened from a series of isomorphic COFs. The photocatalytic properties of C-3 functionalization of indoles by COF-based photocatalysts were first reported.
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