Electrochemical oxidation of catechols in the presence of ketene N,O-acetals: indole formation versus α-arylation
作者:Yue-Xia Bai、Da-Wei Ping、R. Daniel Little、Hong-Yu Tian、Li-Ming Hu、Cheng-Chu Zeng
DOI:10.1016/j.tet.2011.09.126
日期:2011.12
Anodic oxidation of catechols has been investigated in the presence of ketene N,O-acetals using cyclic voltammetry and constant current electrolysis methods. The results show that in the presence of ketene N,O-acetals, the anodic oxidation of 4-methylcatechol affords α-arylated products in satisfactory yields. Meanwhile, indoles can be synthesized from simple 3-substituted catechols or catechol itself
使用循环伏安法和恒流电解方法研究了在烯酮N,O-乙缩醛存在下对儿茶酚的阳极氧化。结果表明,在乙烯酮N,O-乙缩醛的存在下,4-甲基邻苯二酚的阳极氧化可提供令人满意的产率的α-芳基化产物。同时,可以根据ECEC机理由简单的3-取代的邻苯二酚或邻苯二酚本身合成吲哚。另外,通过简单地改变电解质溶液的组成,α-芳基化或吲哚形成可能是主要途径。