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
We describe herein a catalyst-free selective C−H sulfenylation of imidazo[1,2-a]pyridines using sulfonothioates as odorless source of thioarylated reagent in an aqueous medium. The method works for a variety of substitutedimidazo[1,2-a]pyridines with broad functional group tolerance. The methodology has been extends to selective sulfernylation of indoles and imidazothiazoles. The sulfonothioates are
An efficient and convenient copper-catalyzed oxidative chalcogenation of benzothiazoles and imidazo[1,2-a]pyridines with sulfur/selenium powder and aryl boronic acids was developed. This procedure allows access to a wide range of structurally diverse arylchalcogen-substituted benzothiazoles/imidazo[1,2-a]pyridines in good yields and with good functional group tolerance. A biological evaluation revealed
Synthesis of imidazol[1,2-α]pyridine thioethers via using sulfur powder and halides as reactants
作者:Wei Wu、Yingcai Ding、Ping Xie、Qiujie Tang、Charles U. Pittman、Aihua Zhou
DOI:10.1016/j.tet.2017.02.065
日期:2017.4
generating regioselective alkyl-S- and Ar-S-substituted imidazol[1,2-α]pyridine derivatives in good yields under relatively environmentally friendly and mild conditions. This protocol enriches current thioether-producing methods, making up for the shortcomings of previous sulfenylation methods which can only make MeS- and ArS-substituted imidazol[1,2-α]pyridine derivatives.
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。