Facile synthesis of 2-benzoxazoles <i>via</i> CuI/2,2'-bipyridine catalyzed intramolecular C-O coupling of 2-haloanilides
作者:Thachora Venu Saranya、Pambingal Rajan Sruthi、Saithalavi Anas
DOI:10.1080/00397911.2018.1554147
日期:2019.1.17
Development of newer methods for the synthesis of Benzoxazoles has of greater interest due to their wide range of biological activities and pharmaceutical importance. We herein report a facile and general method for the synthesis of 2-substituted Benzoxazoles via copper catalyzed intramolecular C-O cross-coupling of 2-haloanilides. A combination of CuI (5 mol%), 2,2'-bipyridine (10 mol%), Cs2CO3 (2 equiv.)
摘要 由于苯并恶唑的广泛生物活性和药学重要性,开发用于合成苯并恶唑的新方法引起了更大的兴趣。我们在此报告了一种通过铜催化的 2-卤代苯胺的分子内 CO 交叉偶联合成 2-取代苯并恶唑的简便通用方法。CuI (5 mol%)、2,2'-联吡啶 (10 mol%)、Cs2CO3 (2 当量) 在 DMF 溶剂中与 4 Å 分子筛在 140 °C 下的组合,说明了调节 2 反应性的范围-卤代苯胺以中等至良好的产率选择性形成一系列 2-烷基苯并恶唑衍生物。这是首次使用 CuI/2,2'-联吡啶作为催化体系合成 2-取代苯并恶唑的系统研究。发现反应的结果受 2-卤代苯胺的芳族和酰胺取代基的显着影响。图形概要
Novel and efficient heterogeneous polymer supported copper catalyst for synthesis of 2-substituted Benzoxazoles from 2-Haloanilides
作者:Thachora Venu Saranya、Pambingal Rajan Sruthi、Veena Raj、Saithalavi Anas
DOI:10.1016/j.jorganchem.2021.121733
日期:2021.4
A novel polymer supported copper complex is prepared by the immobilization of copper iodide on chemically modified polyacrylonitrile and its application in heterogeneous catalysis is described. The catalyst was prepared by easy method via synthetic modification of Polyacrylonitrile (PAN) using ethylene diamine followed by the complexation with CuI. After characterization, this complex was explored