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.
Iodine-Mediated Difunctionalization of Imidazopyridines with Sodium Sulfinates: Synthesis of Sulfones and Sulfides
作者:Yu-Jing Guo、Shuai Lu、Lu-Lu Tian、En-Ling Huang、Xin-Qi Hao、Xinju Zhu、Tian Shao、Mao-Ping Song
DOI:10.1021/acs.joc.7b02734
日期:2018.1.5
Novel iodine-induced sulfonylation and sulfenylation of imidazopyridines have been described using sodium sulfinates as the sulfur source. This strategy enables highly selective difunctionalization of imidazo[1,2-a]pyridine to access sulfones and sulfides in good yields. A wide range of substrates and functional groups were well-tolerated under optimized conditions. Moreover, control experiments have
已经描述了使用亚磺酸钠作为硫源的新的碘诱导的咪唑并吡啶的磺酰化和亚磺酰化。该策略能够使咪唑并[1,2- a ]吡啶高度选择性地进行双官能化,从而以高收率获得砜和硫化物。在最佳条件下,各种底物和官能团均具有良好的耐受性。此外,已经进行了对照实验,表明了反应机理中涉及的自由基途径。
Visible-light-induced regioselective sulfenylation of imidazopyridines with thiols under transition metal-free conditions
作者:Rajjakfur Rahaman、Shivasish Das、Pranjit Barman
DOI:10.1039/c7gc02906c
日期:——
A metal-freevisible-light-promoted regioselective C-3 sulfenylation of imidazo[1,2-a]pyridines and indoles using thiols has been developed via C(sp2)–H functionalization. This method provides direct access to a wide range of structurally diverse 3-sulfenylimidazopyridines of biological interest. The operational simplicity, eco-energy source, high atom efficiency, and the use of green solvents under
通过C(sp 2)–H官能团开发了一种无金属的可见光促进的咪唑并[1,2- a ]吡啶和吲哚类吲哚类化合物的C-3区域选择性C-3亚磺酰基。该方法提供了直接接触生物感兴趣的结构上广泛的3-亚磺酰基咪唑并吡啶的途径。操作简便,生态能源,高原子效率以及在环境条件下使用绿色溶剂是该方法的一些吸引人的特征。
Aerobic Multicomponent Tandem Synthesis of 3-Sulfenylimidazo[1,2-<i>a</i>]pyridines from Ketones, 2-Aminopyridines, and Disulfides
作者:Wenlei Ge、Xun Zhu、Yunyang Wei
DOI:10.1002/ejoc.201300905
日期:2013.9
reaction was developed for the synthesis of 3-sulfenylimidazo[1,2-a]pyridinesfrom easily available ketones, 2-aminopyridines, and disulfides without DMSO or peroxide as an oxidant. This three-component tandem reaction process involves the formation of imidazo[1,2-a]pyridines followed by Friedel–Crafts sulfenylation in one pot under mild conditions. Both aryl and alkyl ketones afforded the desired products
Unconventional Reactivity with DABCO-<i>Bis</i>
(sulfur dioxide): C-H Bond Sulfenylation of Imidazopyridines
作者:Julie Le Bescont、Chloé Breton-Patient、Sandrine Piguel
DOI:10.1002/ejoc.202000112
日期:2020.4.16
Exploring the unexpected reactivity of DABCO‐bis(sulfur dioxide) on various imidazo[1,2‐a]pyridines expanded the toolbox of the sulfenylation reagent. Starting from three simple building blocks, this three‐component transformation led to various C‐3 sulfenylated substituted imidazo[1,2‐a]pyridines in moderate to good yields.
探索DABCO-双(二氧化硫)在各种咪唑并[1,2- a ]吡啶上的出乎意料的反应性,扩大了亚磺酰化试剂的工具箱。从三个简单的结构单元开始,这种由三部分组成的转化以中等到良好的产率产生了各种C-3磺化取代的咪唑并[1,2- a ]吡啶。