A new and efficient method for the synthesis of 2-N-(aryl)-1,3,4-oxadiazole-2,5-diamine derivatives
作者:Manuri Brahmayya、Fan-Shuan Liu、Shing-Yi Suen、Chun-Chieh Huang、Shenghong A. Dai、Yi-Syuan Guo、Yi-Fen Chen
DOI:10.1007/s11164-015-2128-9
日期:2016.3
We report a series of cyclic analogues of 2,5-diamino-1,3,4-oxadiazoles which were prepared in a simple and general protocol. This method involves easy cyclisation of N-(aryl)-1,2-hydrazinedicarboxamides and mediated by tosylchloride/pyridine in ethanol (solvent) under a reflux condition (79–80 °C), over a time period of 20 h. We prepared different examples in a higher range of yields (80–98 %) by using this protocol.
我们报告了一系列 2,5-二氨基-1,3,4-恶二唑的环状类似物,这些类似物的制备方法简单而通用。该方法涉及 N-(芳基)-1,2-肼二甲酰胺的简易环化,并在乙醇(溶剂)中以甲苯磺酰氯/吡啶为介质,在回流条件(79-80 °C)下进行,历时 20 h 。通过使用这种方法,我们制备了不同的实例,收率范围更高(80-98 %)。