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
Copper-catalyzed thiolation of imidazo[1,2-a]pyridines with (hetero)aryl thiols using molecular oxygen
作者:Zhishuo Zheng、Deyu Qi、Lei Shi
DOI:10.1016/j.catcom.2015.03.023
日期:2015.6
A new and facile copper-catalyzed thiolation of imidazo[1,2-a]pyridines with (hetero)aryl thiols was developed for the formation of C-S bond by using molecular oxygen as oxidant under base-free conditions. The presented protocol has provided the selective C-3 sulfenated products with good yield. A computational study was carried out by using the B3LYP density functional theory to elucidate the regioselectivity of C-2 and C-3. Calculation results indicated that the thiolation toward C-3 was easier and smoother, which was consistent with our experiment results. (C) 2015 Elsevier B.V. All rights reserved.