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。
Regioselective, Solvent- and Metal-Free Chalcogenation of Imidazo[1,2-<i>a</i>
]pyridines by Employing I<sub>2</sub>
/DMSO as the Catalytic Oxidation System
作者:Jamal Rafique、Sumbal Saba、Alisson R. Rosário、Antonio L. Braga
DOI:10.1002/chem.201600800
日期:2016.8.8
molecular‐iodine‐catalyzed chalcogenations (S and Se) of imidazo[1,2‐a]pyridines were achieved by using diorganoyl dichalcogenides undersolvent‐freeconditions. This approach afforded the desired products that had been chalcogenated regioselectively at the C3 position in up to 96 % yield by using DMSO as an oxidant, in the absence of a metal catalyst, and under an inert atmosphere. This mild, green approach allowed
通过在无溶剂条件下使用二有机基二卤化氢实现咪唑并[1,2- a ]吡啶的高效分子碘催化硫属元素化(S和Se)。通过使用DMSO作为氧化剂,在没有金属催化剂的情况下,并且在惰性气氛下,该方法提供了所需的产物,该产物已经在C3位置进行了区域硫磺化,产率高达96%。这种温和的绿色方法可以制备具有结构多样性的不同类型的硫族化咪唑并[1,2- a ]吡啶。此外,当前协议还扩展到其他N杂环核。
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。
Direct, Metal-free C(sp<sup>2</sup>
)−H Chalcogenation of Indoles and Imidazopyridines with Dichalcogenides Catalysed by KIO<sub>3</sub>
作者:Jamal Rafique、Sumbal Saba、Marcelo S. Franco、Luana Bettanin、Alex R. Schneider、Lais T. Silva、Antonio L. Braga
DOI:10.1002/chem.201705404
日期:2018.3.15
synthesis of 3‐Se/S‐indoles and imidazo[1,2‐a]pyridines through direct C(sp2)−H bond chalcogenation of heteroarenes with half molar equivalents of different dichalcogenides, using KIO3 as a non‐toxic, easy‐to‐handle catalyst and a stoichiometric amount of glycerol. The reaction features are high yields, based on atom economy, easy performance on gram‐scale, metal‐ and solvent‐free conditions as well as applicability
本文中,我们报告了一种更环保的协议,该方法通过杂芳烃的直接C(sp 2)-H键硫代半数当量的不同二硫代半乳糖苷合成3-Se / S-吲哚和咪唑并[1,2- a ]吡啶KIO 3是一种无毒,易于操作的催化剂和化学计量的甘油。该反应的特征是基于原子经济性的高收率,在克级,无金属和无溶剂条件下易于操作以及适用于不同类型的N-杂芳烃。
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。