Copper on charcoal: Cu<sup>0</sup> nanoparticle catalysed aerobic oxidation of α-diazo esters
作者:Rong Zhao、Jiangge Teng、Zhiwei Wang、Wenwen Dong、Jia Lin、Changhu Chu
DOI:10.1039/d1ob00811k
日期:——
By using a charcoal supported nano Cu0 catalyst (Cu/C), a highly efficient oxidation of α-diazo esters to α-ketoesters with molecular oxygen as the sole oxidant has been developed. In the presence of the Cu/C catalyst, 2-aryl-α-diazo esters with both electron-donating and electron-withdrawing groups can be oxidized to the corresponding α-ketoesters efficiently. Furthermore, this Cu/C catalyst can catalyse
通过使用木炭负载纳米Cu 0催化剂(Cu / C),已开发出一种以分子氧为唯一氧化剂将α-重氮酯高效氧化为α-酮酯的方法。在Cu/C催化剂存在下,具有给电子基团和吸电子基团的2-芳基-α-重氮酯可以有效地氧化成相应的α-酮酯。此外,该Cu/C催化剂可以催化芳基α-重氮酯与水反应生成芳基酮酯、2-芳基-2-羟基乙酸酯和2-芳基乙酸酯。在这种情况下,水被α-重氮酯分解,重氮基团被水中的氧或氢原子取代。机理研究表明,α-重氮酯与氧的反应通过自由基途径进行。在 2,2,6,6-四甲基哌啶氮氧化物存在下,α-重氮酯与氧的反应被显着抑制。此外,通过同位素示踪法研究了α-重氮酯与水的反应,GCMS检测表明α-重氮酯与水发生了歧化反应。