Scope and Limitations of the Base-Free Copper(I) Oxide Catalyzed<i>N</i>-Heteroarylation of 1<i>H</i>-(Benz)imidazoles with<i>B</i>-Heteroarylboronic Acids or 2-Heteroaryl-4,4,5,5-tetramethyl-1,3,2-dioxaborolanes
作者:Agathe Begouin、Maria-João R. P. Queiroz
DOI:10.1002/hlca.201200310
日期:2013.5
copper(I) oxide catalyzed N‐arylation reaction performed in MeOH at room temperature for the synthesis of N‐substituted azoles and amines was extended to the heterocyclic series, i.e., we report herein the base‐free copper(I) oxide catalyzed N‐heteroarylation of 1H‐(benz)imidazole, by means of electron‐rich or electron‐deficient B‐heteroarylboronic acids or 2‐heteroaryl‐4,4,5,5‐tetramethyl‐1,3,2‐dioxaborolanes
在室温下于甲醇中进行的,已知的非常有效的无碱氧化铜(I)催化的N芳基化反应,用于合成N取代的唑和胺,已扩展为杂环系列,即我们在此报告了无碱铜(I)通过富电子或缺电子的B-杂芳基硼酸或2-杂芳基-4,4,5,5-四甲基-1,3催化1 H-(苯)咪唑的N-杂芳基化,2-二氧杂硼烷(方案1和2)。在这些条件下,获得的N-杂芳基化1 H-(苯并)咪唑的收率良好至优异(表1和表2)。2)。这是首次在这种类型的反应中使用2-杂芳基-4,4,5,5-四甲基-1,3,2-二氧杂硼烷。