Solvent-controlled photosensitized divergent C3-ethoxycarbonylmethylation/hydroxyalkylation of imidazo[1,2-a]pyridines with diethyl bromomalonate
作者:Mengmeng Huang、Lianjun Wang、Xiaowen Yang、Jung Keun Kim、Ming Gong、Jianye Zhang、Yabo Li、Yangjie Wu
DOI:10.1016/j.tet.2022.132988
日期:2022.11
imidazo[1,2-a]pyridines under blue-LED irradiation using the same starting material. The desired products were isolated in moderate to high yields. Based on the results of control experiments, cyclic voltammetry and spectrophotometric studies, we proposed that the studied reaction might proceed via a radical process. Imidazo[1,2-a]pyridine diethyl malonate is not only a product, but also a main intermediate
在本报告中,开发了一种简单有效的溶剂控制化学发散方法,使用相同的起始材料在蓝光 LED 照射下实现咪唑并[1,2- a ]吡啶的 C3-乙氧基羰基甲基化/羟烷基化。所需产物以中等至高产率分离。基于对照实验、循环伏安法和分光光度法研究的结果,我们提出所研究的反应可能通过自由基过程进行。咪唑并[1,2- a ]吡啶丙二酸二乙酯不仅是产品,而且是生产咪唑并[1,2-a]羟烷基化和烷氧基烷基化产品的主要中间体]吡啶。更重要的是,光催化剂对咪唑并[1,2- a ]吡啶起到氧化剂的作用,对溴丙二酸二乙酯起到还原剂的作用。