A Facile Synthesis of α-Aryl α-Oxoheterocyclic Ketene N,N-Acetals Bearing an Electron-Rich Catechol Subunit-An Electrochemical Oxidative Approach
作者:Cheng-Chu Zeng、Da-Wei Ping、Yi-Sheng Xu、Li-Ming Hu、Ru-Gang Zhong
DOI:10.1002/ejoc.200900733
日期:2009.11
Heterocyclic ketene N,N-acetals are versatile building blocks for the synthesis of nitrogen-containing heterocyclic compounds. In the present work, the anodic oxidation of catechols 2a–f in the presence of α-oxoheterocyclic ketene N,N-acetals 1a–d has been investigated using cyclic voltammetry and controlled-potential electrolysis methods. These results indicate that α-oxoheterocyclic ketene N,N-acetals could
杂环烯酮 N,N-缩醛是合成含氮杂环化合物的通用构件。在目前的工作中,使用循环伏安法和控制电位电解方法研究了在 α-氧杂环烯酮 N,N-缩醛 1a-d 存在下儿茶酚 2a-f 的阳极氧化。这些结果表明,α-氧杂环烯酮 N,N-缩醛可以与阳极生成的邻苯醌进行迈克尔加成反应,并以良好的收率产生 α-碳芳基化产物。这种方法为合成含有富电子芳环的α-芳基α-氧代杂环烯酮N,N-缩醛提供了有效和“绿色”的途径。此外,进行了密度泛函理论计算以解释α-碳芳基化产物的排他性形成。(© Wiley-VCH Verlag GmbH &