Electrochemical Oxidative C—H Sulfenylation of Imidazopyridines with Hydrogen Evolution
作者:Yong Yuan、Yangmin Cao、Jin Qiao、Yueping Lin、Xiaomei Jiang、Yaqing Weng、Shan Tang、Aiwen Lei
DOI:10.1002/cjoc.201800405
日期:2019.1
Selective oxidativeC—H sulfenylation of imidazopyridine heterocycles is achieved using an undivided electrolytic cell. The reaction avoids the use of stoichiometric amount of external chemical oxidant and produces hydrogen gas as the only byproduct. Both aryl and aliphatic thiols demonstrate good reactivity for C—S bond formation.
The assembly of two functional molecules via a sulfur linking atom allows an access to a diverse array of thioether‐containing compounds. Herein, we disclose a metal‐free thiolation of imidazopyridines with a variety of functionalized haloalkanes using elemental sulfur.
synthesized and their antiinflammatory activities toward NLRP3 (nucleotide-binding domain leucine-rich repeat containing protein family,pyrin domain-containing 3,also known as cryopyrin or NALP3) inflammasome were evaluated in vitro. Two lead compounds, TBZ-09 and TBZ-21, were identified by antiproduction of IL-1β. In the second round of biological evaluation, based on the lead, 34 more compounds were synthesized
Cu-catalyzed sulfenylation of imidazol[1,2-a]pyridine via C–H functionalization using a combination of Na<sub>2</sub>S<sub>2</sub>O<sub>3</sub> and halides
halides (Cl, Br, I) or iodobenzene homologues is described. The reactions proceeded smoothly, giving regioselective 2-phenylimidazo[1,2-a]pyridine thioether derivatives in good yields via a C–H functionalization process. More importantly, this method has extended the existing methods by offering a better method which can make both alkyl and aryl thioether derivatives under one set of reaction conditions
描述了通过使用无机盐Na 2 S 2 O 3和烷基卤化物(Cl,Br,I)或碘代苯同系物的新型铜催化的亚磺酰基化方法。反应进行得很顺利,通过C–H官能化过程可得到高选择性的区域选择性2-苯基咪唑并[1,2- a ]吡啶硫醚衍生物。更重要的是,该方法通过提供可以在一组反应条件下同时制备烷基和芳基硫醚衍生物的更好方法,扩展了现有方法。
One-pot synthesis of imidazo[1,2-α]pyridine thioethers using imidazo[1,2-α]pyridines, arylsulfonyl chlorides and hydrazine
作者:Jin Wang、Jie Zhu、Aihua Zhou
DOI:10.1080/10426507.2019.1686376
日期:2020.3.3
Abstract A one-pot reaction of making RS-substituted imidazo[1,2-α]pyridinederivatives by directly using aryl or alkylsulfonyl chloride and hydrazine was developed, selectively giving good yields of the expected products. Compared with previously reported methods of using ArSO2NHNH2 as a sulfur source, this method is much cheaper, more practical and convenient and enriches current methods to make