The Synthesis of 3,5-Diamino-1,2,4-oxadiazoles. 1st Communication
作者:Jefferson W. Tilley、Henri Ramuz
DOI:10.1002/hlca.19800630411
日期:1980.6.6
Reaction of the 1-substituted-3-cyano-isothioureas 6 with hydroxylamine gave mixtures of the 5-amino-3-substituted-amino-1,2,4-oxadiazoles 1 and the isomeric 3-amino-5-substituted-amino-1,2,4-oxadiazoles 8 in which 1 usually predominated. The structural assignment of these products is discussed. In a second method, the 2-hydroxy-1-methyl-1-phenyl-guanidine 15 was converted to the corresponding 3-d
1-取代的-3-氰基-异硫脲6与羟胺的反应得到了5-氨基-3-取代的氨基-1,2,4-恶二唑1和异构体3-氨基-5-取代的氨基-的混合物1,2,4-恶二唑8其中1通常占主导地位。讨论了这些产品的结构分配。在第二种方法中,将2-羟基-1-甲基-1-苯基-胍15转化为相应的3-二取代-氨基-5-三氯甲基-1,2,4-恶二唑16,即5-的前体。氨基衍生物17通过三氯甲基的亲核取代。