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。
Electrochemically Enabled Direct C3‐Formylation of Imidazopyridines with Me
<sub>3</sub>
N as a Carbonyl Source
作者:Zhicong Tang、Gang Hong、Shiyun Sun、Limin Wang
DOI:10.1002/asia.202300001
日期:——
A metal- and oxidant-free electrochemical methodology for C-3 formylation of imidazopyridines using trimethylamine as a one-carbon source has been established. The strategy demonstrated good functional-group tolerance and could be scaled up to gram scale, ensuring late-stage functionalization and total/formal synthesis of pharmaceutical molecules. Furthermore, unexpected hexafluoroisopropoxylation
K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>‐Mediated C‐3 Formylation of Imidazopyridines Using Glyoxylic Acid
作者:Harish K. Indurthi、Samarpita Das、Pallavi Saha、Deepak K. Sharma
DOI:10.1002/ejoc.202300829
日期:2023.12
A metal-free formylation of imidazopyridines with K2S2O8 by direct decarboxylative cross-coupling of glyoxylic acid is described. This reaction features broad substrate scope, good functional group tolerance, and generate products in good yields.
描述了通过乙醛酸的直接脱羧交叉偶联用K 2 S 2 O 8进行咪唑并吡啶的无金属甲酰化。该反应底物范围广,官能团耐受性好,产物收率高。
Visible light induced tetramethylethylenediamine assisted formylation of imidazopyridines
作者:Golam Kibriya、Avik K. Bagdi、Alakananda Hajra
DOI:10.1039/c8ob00532j
日期:——
A metal-free visiblelight induced C-3 formylation of imidazo[1,2-a]pyridine has been developed using tetramethylethylenediamine (TMEDA) as a one carbon source. An array of 3-formyl imidazo[1,2-a]pyridines with wide functionality are synthesized using rose bengal as a photosensitizer under ambient air.
使用四甲基乙二胺(TMEDA)作为一种碳源,开发了一种无金属的可见光诱导的咪唑并[1,2- a ]吡啶的C-3甲酰化反应。在环境空气下,使用玫瑰红作为光敏剂,合成了具有广泛功能的3-甲酰基咪唑并[1,2- a ]吡啶。