Visible-Light-Induced Regioselective Cyanomethylation of Imidazopyridines and Its Application in Drug Synthesis
作者:Qing Chang、Zhengyi Liu、Ping Liu、Lu Yu、Peipei Sun
DOI:10.1021/acs.joc.7b00750
日期:2017.5.19
3-Cyanomethylated imidazopyridines were synthesized via a visible light-promoted reaction of imidazopyridines with bromoacetonitrile or iodoacetonitrile catalyzed by fac-Ir(ppy)3 under mild conditions. For the substrates with various substituents on benzene or pyridine ring, the reaction proceeded smoothly to give the corresponding products in moderate to good yields. The synthetic utility of this
Visible-light-mediated C3-azolylation of imidazo[1,2-a]pyridines with 2-bromoazoles
作者:Qing Chang、Zhongjie Wu、Lu Yu、Ping Liu、Peipei Sun
DOI:10.1039/c7ob00883j
日期:——
The C3-azolylation of imidazo[1,2-a]pyridines was developed via a visible light-mediated reaction of imidazopyridines with 2-bromoazoles catalyzed by Ir(ppy)2(dtbbpy)PF6 under mild conditions. For the imidazo[1,2-a]pyridines with various substituents on benzene or the pyridine ring and a variety of azoles, the reaction proceeded smoothly to give 3-(azol-2-yl)imidazo[1,2-a]pyridines in moderate to good
咪唑的C3-azolylation [1,2一]吡啶开发通过与由铱催化的(PPY)2-咪唑并吡啶bromoazoles的可见光介导的反应2(dtbbpy)PF 6在温和条件下。对于在苯或吡啶环上具有各种取代基的咪唑并[1,2- a ]吡啶和各种唑,反应进行得很顺利,得到了3-(azol-2-yl)咪唑并[1,2- a ]吡啶中等至良好的产量。
Visible light-induced C3-sulfonamidation of imidazopyridines with sulfamides
作者:Yongyuan Gao、Shu Chen、Weiye Lu、Weijin Gu、Ping Liu、Peipei Sun
DOI:10.1039/c7ob02029e
日期:——
A visible light-induced regioselective sulfonamidation of imidazo[1,2-a]pyridines was developed using sulfamides as the nitrogen sources and aqueous NaClO solution as the oxidant under mild conditions. With the imidazo[1,2-a]pyridines bearing various substituents, the reaction proceeded smoothly to furnish the C3-sulfonamidation products in moderate to good yields. The method was also suitable for
在温和条件下,以磺酰胺为氮源,以NaClO水溶液为氧化剂,开发了可见光诱导的咪唑并[1,2- a ]吡啶区域选择性磺酰胺化反应。用带有各种取代基的咪唑并[1,2- a ]吡啶,反应进行得很顺利,以中等至良好的产率提供了C3-磺酰胺化产物。该方法也适用于某些其他咪唑杂环的磺酰胺化。
3-(acylaminomethyl)imidazo[1,2-a]pyridine derivatives and pharmaceutical
申请人:Synthelabo
公开号:US04767755A1
公开(公告)日:1988-08-30
A compound which is a 3-(acylaminomethyl)imidazo[1,2-a]pyridine derivative of formula (I) ##STR1## or a pharmacologically acceptable acid addition salt is useful in therapy.
We have successfully developed a novel and efficient catalyst-free method for the synthesis of 3-nitroso-substituted imidazopyridines, from readily available imidazo[1,2-a]pyridines and tert-butyl nitrite, in good to excellent yields. Importantly, the use of transition-metal catalysts, stoichiometric amounts of acids, and toxic or potentially dangerous oxidants is avoided. This easy and practical method complements nitrosation reactions by expanding the scope and practicality, and should attract much attention in synthetic and pharmaceutical chemistry.