A number of studies involving some reactions of 4-amino-4,5-dihydro-1H-1,2,4-triazol-5-ones have been made in recent years. On the other hand, the reactions of some N-aminoheteroaryls with 1,4-diketones or 1,4-dialdehydes to give N,N'-linked biheteroaryls have also been reported. In the present study, a series of 3-alkyl-4-amino-4,5-dihydro-1H-1,2,4-triazol-5-ones I were condensed in good yields with the succinaldehyde equivalent, 2,5-dimethoxytetrahydrofuran to give N,N'-bis(3-alkyl-4,5-dihydro-1H-1,2,4-triazol-5-on-4-yl)-1,4-butanediimines II or 1-(3-alkyl-4,5-dihydro-1H-1,2,4-triazol-5-on-4-yl)pyrroles III in nitrobenzene or acetic acid medium, respectively. To obtain more information on type II compounds, 3-methyl-4-ethylidenamino-4,5-dihydro-1H-1,2, 4-triazol-5-one (IV) was synthesized.
近年来进行了一些涉及4-氨基-4,5-二氢-1H-1,2,4-三唑-5-酮的反应研究。另一方面,已经报道了一些N-氨基杂环芳烃与1,4-二酮或1,4-二醛反应形成N,N'-偶联的双杂环芳烃的反应。在本研究中,一系列3-烷基-4-氨基-4,5-二氢-1H-1,2,4-三唑-5-酮I与琥珀醛等价物2,5-二甲氧基四氢呋喃反应,在硝基苯或乙酸介质中得到N,N'-双(3-烷基-4,5-二氢-1H-1,2,4-三唑-5-酮-4-基)-1,4-丁二亚胺II或1-(3-烷基-4,5-二氢-1H-1,2,4-三唑-5-酮-4-基)吡咯III,收率良好。为了获得更多关于II型化合物的信息,合成了3-甲基-4-乙烯基氨基-4,5-二氢-1H-1,2,4-三唑-5-酮IV。