Copper-Catalyzed Chelation-Assisted<i>ortho</i>-Nitration of 2-Aryls Using Pharmacophoric Benzothiazoles and Benzoxazoles as Directing Groups
作者:Botla Vinayak、Akudari Ashok、Malapaka Chandrasekharam
DOI:10.1002/ejoc.201701187
日期:2017.12.22
Copper-catalyzed chelation assisted ortho-nitration of aryls with benzazoles as efficient directing group has been achieved. The reaction is general and efficient for electronically differentiated aryls and pharmacophorically important directing groups i.e., benzoxazoles, benzthiazoles and benzimidazoles. This class of nitro-products have significance as fluorogenic and potential nitroreductase substrates
已经实现了以苯并唑为有效导向基团的铜催化螯合辅助芳基邻硝化。对于电子分化的芳基和药理学上重要的导向基团,即苯并恶唑、苯并噻唑和苯并咪唑,该反应是通用且有效的。这类硝基产物作为荧光和潜在的硝基还原酶底物具有重要意义,可用于检测临床上重要的微生物。硝化反应在廉价的铜催化剂和温和、廉价且环保的硝基源 Fe(NO3)3.9H2O 下进行。这种操作简单且具有官能团耐受性的方案突出了 2-芳基苯并唑硝化的高区域选择性,而无需排除空气或水分。