Heterocyclic compounds from urea derivatives. Part XIII. Addition–cyclisations of ethoxycarbonylhydrazine and carbodi-imides
作者:Frederick Kurzer、David R. Hanks
DOI:10.1039/j39680001375
日期:——
Ethoxycarbonylhydrazine reacts with two molar proportions of diphenylcarbodi-imide to give the 2 : 1-adduct 1,2-bis-NN′-diphenylamidino-1-ethoxycarbonylhydrazine. This cyclises, with loss of arylamine, to 1-ethoxycarbonyl-4-phenyl-3,5-bisphenylimino-1,2,4-triazolidine, which can be hydrolysed to give 3,5-dianilino-4-phenyl-1,2,4-triazole. The 2 : 1-adduct is hydrolysed by ethanolic hydrochloric acid
乙氧羰基肼与两个摩尔比例的二苯基碳二亚胺反应,生成2:1-加合物1,2-双-NN'-二苯基phenyl基-1-乙氧羰基肼。该环化酯失去芳基胺,生成1-乙氧基羰基-4-苯基-3,5-双苯基亚氨基-1,2,4-三唑烷,可水解得到3,5-二苯胺基-4-苯基-1,2。 ,4-三唑。2:-1加合物被乙醇盐酸水解成1-羧基-1,2-双-NN'-二苯基ami肼,可通过碱环化得到3-苯胺基-5-羟基-4-苯基-1, 2,4-三唑。