Amidation of Aryl Chlorides Using a Microwave-Assisted, Copper-Catalyzed Concurrent Tandem Catalytic Methodology
作者:Raymond K. Chang、Brice P. Clairmont、Shirley Lin、Amy H. Roy MacArthur
DOI:10.1021/acs.organomet.9b00561
日期:2019.11.25
A concurrent tandem catalytic (CTC) methodology has been developed for the amidation of aryl chlorides where the aryl chloride is first converted to an aryl iodide via halogen exchange and the aryl iodide is subsequently transformed into the aryl amide. A variety of aryl chlorides were converted to aryl amides in up to 85% isolated yield using 20 mol % CuI, 60 mol % N,N′-cyclohexane-1,2-diamine, 2
已经开发了同时进行的串联催化(CTC)方法来酰胺化芳基氯化物,其中首先通过卤素交换将芳基氯化物转化为芳基碘化物,然后将芳基碘化物转化为芳基酰胺。使用20 mol%的CuI,60 mol%的N,N'-环己烷-1,2-二胺,2.2当量的K 2 CO 3将各种芳基氯化物以高达85%的分离产率转化为芳基酰胺。0.75-1小时后,在200°C的乙腈中加入1.05–1.5当量的酰胺。相同的铜/配体体系在同时催化过程的两个步骤中均用作多功能催化剂,其中碘化物的化学计量低于化学计量。机理研究与通过非自由基机制发生的四氯化碳酰胺化反应一致。进行动力学建模以研究芳基氯或芳基溴的竞争性直接酰胺化在CTC酰胺化反应过程中随时间的推移对产物形成的影响。