Heterogeneous copper-catalyzed three-component reaction of 2-aminopyridines, acetophenones and benzyl cyanide towards 3-cyanoimidazo[1,2-a]pyridines
作者:Bingbo Niu、Chongren You、Bin Huang、Mingzhong Cai
DOI:10.1016/j.catcom.2019.01.025
日期:2019.4
The heterogeneous three-componentreaction of 2-aminopyridines, acetophenones and benzyl cyanide was achieved in NMP at 120 °C by using an MCM-41-anchored L-proline‑copper(I) complex [MCM-41-L-Proline-CuI] as catalyst under air, yielding a wide variety of 3-cyanoimidazo[1,2-a]pyridines in moderate to high yields. The new heterogeneous copper catalyst exhibited higher catalytic activity than CuI, and
的2-氨基吡啶,苯乙酮和苄基氰的非均相三组分反应在NMP中在120℃下通过使用MCM-41锚定实现大号-脯氨酸-铜(I)配合物[MCM-41-大号-脯氨酸翠在空气中作为催化剂,以中等至高收率产生了多种3-氰基咪唑并[1,2- a ]吡啶。新的非均相铜催化剂显示出比CuI更高的催化活性,并且可以以几乎恒定的活性循环至少八次。
Copper-mediated three-component synthesis of 3-cyanoimidazo[1,2-a]pyridines
作者:Qiaodong Wen、Ping Lu、Yanguang Wang
DOI:10.1039/c5cc05821j
日期:——
A copper-mediated three-component approach towards the synthesis of 3-cyanoimidazo[1,2-a]pyridines from 2-aminopyridines, acetophenones and benzyl cyanide was developed. This cascade reaction proceeds through a copper-mediated oxidative release of cyanide from benzyl cyanide, a copper-mediated Ortoleva–King reaction, and a copper-catalyzed cyanation.
Copper- and DMF-mediated switchable oxidative C–H cyanation and formylation of imidazo[1,2-<i>a</i>]pyridines using ammonium iodide
作者:Xuan Li、Shoucai Wang、Jiawang Zang、Meichen Liu、Guangbin Jiang、Fanghua Ji
DOI:10.1039/d0ob01838d
日期:——
The cyanation and formylation of imidazo[1,2-a]pyridines were developed under copper-mediated oxidative conditions using ammonium iodide and DMF as a nontoxic combined cyano-group source and DMF as a formylation reagent. Mechanistic studies indicate that the cyanation of imidazo[1,2-a]pyridines proceeds through a two-step sequence: initial iodination and then cyanation. The cyanation has a broad substrate
咪唑并[1,2 - a ]吡啶的氰化和甲酰化是在铜介导的氧化条件下开发的,使用碘化铵和 DMF 作为无毒的组合氰基源,DMF 作为甲酰化试剂。机理研究表明,咪唑并[1,2 - a ]吡啶的氰化过程分为两步:初始碘化,然后是氰化。氰化具有广泛的底物范围和高官能团耐受性,并且可以在克级安全地进行。使用广泛可用的 DMF 作为甲酰化试剂和环境友好的分子氧作为氧化剂的新型铜介导的甲酰化也已被开发出来。该协议还为临床使用的沙利吡坦的合成提供了一种方便的方法。
Copper iodide mediated telescoped synthesis of 3-cyanoimidazo[1,2-a]pyridines, photophysical and DFT studies
作者:Pallavi Saha、Harish K. Indurthi、Samarpita Das、Hemlata Diwan、Deepak K. Sharma
DOI:10.1016/j.molstruc.2023.135612
日期:2023.8
efficient copper iodide-mediated synthesis of 3-cyanoimidazo[1,2-a]pyridines (4a-4m) from readily available methyl ketones, aminopyridines, and ethyl(ethoxymethylene)cyanoacetate is described. Copper(I)-catalyzed annulation between different aminopyridines and various methyl ketones resulted in the formation of imidazo[1,2-a]pyridines (IPs). The resulting IPs undergo C3 cyanation by cyanide anion generated