4-triazoles were obtained in moderate to good yields (33–45%, based on isoselenocyanates). The selenium powder and aromatic amine side products during the reaction could be recycled for efficient preparation of isoselenocyanates, which improved the atom economy. A plausible mechanism was proposed for the formation of the target products.
开发了一种新颖且方便的一锅法合成 3-
氨基-2H-
1,2,4-三唑,通过环脱
硒作用从两分子异
硒氰酸酯和
水合
肼中合成。以中等至良好的产率(33-45%,基于异
硒氰酸酯)获得了各种 3-
氨基-2H-
1,2,4-三唑。反应过程中
硒粉和芳胺副产物可以回收利用,高效制备异
硒氰酸酯,提高了原子经济性。提出了形成目标产物的合理机制。