The reaction of methylhydrazine with N-cyanoazomethines 1 containing a thioalkyl leaving group yields the 3-amino-1,2,4-triazole derivatives 2, whereas the N-cyanoazomethines 1 containing an alkoxy leaving group give the isomeric 5-amino-1,2,4-triazoles 3. The yields are excellent and the position selectivity is high. The structures of the 1,2,4-triazole derivatives were determined with the aid of
甲基
肼与含有
硫代烷基离去基团的N-
氰基偶氮
亚胺1的反应生成3-
氨基-
1,2,4-三唑衍
生物2,而含有烷氧基离去基团的N-
氰基偶氮
亚胺1给出了异构体5-
氨基-1, 2,4-三唑3.产率极高,位置选择性高。
1,2,4-三唑衍
生物的结构借助质子偶联的13 C-NMR确定。光谱。