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。