A metal-free direct thiolation of imidazoheterocycles with various thiophenol in water at roomtemperature has been developed. In addition, the chemistry provides several advantages including mild condition, high yields, good functional group tolerance, green solvents and suitable for large-scale operations.
sulfenylation of imidazo[1,2-a]pyridines via C(sp(2))-H bondfunctionalization has been achieved using sulfonyl hydrazides as a thiol surrogate. A library of 3-sulfanylimidazopyridines with broad functionalities was synthesized under metal and oxidant-free practical reaction conditions. This methodology is also applicable for the regioselective sulfenylation of imidazo[2,1-b]thiazole and benzo[d]imidazo[2,1-b]thiazole
Microwave-assisted and catalyst-free sulfenylation of imidazo[2,1-<i>b</i>]thiazoles with sulfonyl hydrazides in water
作者:Shaohua Wang、Run Luo、Lina Guo、Tianxi Zhu、Xu Chen、Wenjie Liu
DOI:10.1080/10426507.2020.1768537
日期:2020.10.2
Abstract An efficient microwave-assisted and catalyst-free sulfenylation of imidazo[2,1-b]thiazoles with sulfonyl hydrazides has been developed in water. This method is practical and environmental friendly, and can be performed within a short reaction time. The sulfenylation reaction shows high regioselectivity, and excellent functional-group compatibility, giving the desired products in moderate to
Iodine–triphenylphosphine mediated sulfenylation of imidazoheterocycles with sodium sulfinates
作者:Xuhu Huang、Shucheng Wang、Bowen Li、Xin Wang、Zemei Ge、Runtao Li
DOI:10.1039/c4ra17237j
日期:——
An efficient approach to sulfenyl imidazoheterocycles has been developed via iodine–triphenylphosphine mediated direct sulfenylation of imidazoheterocycles with sodiumsulfinates. The reactions proceed smoothly under transition-metal-free conditions with a broad range of substrate scope, giving the desired products in moderate to excellent yields.
Visible-light-promoted sodium iodide-mediated sulfenylation of imidazo[1,2-a]pyridines heterocycle using thiosulfate as odorless electrophilic arylsulphenyl source
作者:Zhen Xie、Mengxin Li、Molai Zhao、Xiaoqing Wen、Li Lin、Hezhong Jiang、Zongrui Hou、Jiahong Li
DOI:10.1016/j.tetlet.2024.154915
日期:2024.2
iodide-mediated sulfuration reaction of imidazole heterocycles, prompted by visible light and using thiosulfate as an odorless electrophilic arylsulphenyl source, has been developed. Mechanistic investigations suggest that sodium iodide and thiol sulfonic ester produce a sulfur cationic intermediate upon light irradiation, which then participates in electrophilic substitution with an aromatic heterocycle. Exhibiting