作者:Abdelrahman Hamdi、Amany S. Mostafa、Cedric Nana Watat、Mathieu Y. Laurent、Kawther Ben Ayed、Khalid B. Selim、Gilles Dujardin
DOI:10.1016/j.tetlet.2016.11.061
日期:2016.12
Copper-catalyzed vinylation of 2- and 4-hydroxy pyridine and quinoline affords exclusively N-vinylation products. However, vinyl ethers of 4-hydroxy pyridine and quinoline can be prepared via a three-step sequence involving copper-catalyzed C-O cross coupling reaction of the corresponding N-heteroaryl bromides with ethylene glycol, chlorination of the terminal alcohol, and dehydrohalogenation of the
铜催化的2-和4-羟基吡啶和喹啉的乙烯基化仅提供N-乙烯基化产物。但是,可以通过三步法制备4-羟基吡啶和喹啉的乙烯基醚,该过程涉及相应的N-杂芳基溴化物与乙二醇的铜催化CO交叉偶联反应,末端醇的氯化和β的脱卤化氢。 -氯醚。尽管在2-羟基系列中效率不高,但是该方法可以方便地应用于以中等到良好的总产率制备各种氮杂-芳基乙烯基醚。