Convenient syntheses of 5-[(2-methyl-5-nitro-1<i>H</i>-imidazol-1-yl)methyl]-1,3,4-oxadiazole-2(3<i>H</i>)thione and N-substituted 2-amino-5-[(2-methyl-5-nitro-1<i>H</i>-imidazol-1-yl)methyl]-1,3,4-thiadiazoles
作者:Javad Mirzaei、Hooshang Pirelahi、Mohsen Amini、Abbas Shafiee
DOI:10.1002/jhet.5570450343
日期:2008.5
compound 10 afforded alkyl 2-(5-[(2-methyl-5-nitro-1H-imidazol-1-yl)methyl]-1,3,4-oxadiazol-2-ylthio)acetate (11) in good yield. Reaction of hydrazide 9 with substituted isothiocynate yielded 1-[2-(2-methyl-5-nitro-1H-imidazol-1-yl)acetyl]-4-aryl(or ethyl)thiosemicarbazide (12) which was cyclized in acidic media to N-substituted 2-amino-5-[(2-methyl-5-nitro-1H-imidazol-1-yl)methyl]-1,3,4-thiadiazole (13)
用重铬酸钠氧化甲硝唑(4),得到相应的2-(2-甲基-5-硝基-1 H-咪唑-1-基)乙酸(5),将其与1-丁醇酯化,得到2-(丁基) 2-甲基-5-硝基-1 H-咪唑-1-基)乙酸酯(8)。后者与水合肼的反应得到2-(2-甲基-5-硝基-1 H-咪唑-1-基)乙酰肼(9)。化合物5-[(2-甲基-5-硝基-1H-咪唑-1-基)甲基] -1,3,4-氧杂二唑-2(3H)-硫酮(10)可通过以下方法获得:化合物9与二硫化碳在碱性介质中的反应 化合物的后续烷基化10得到2-(5-[(5-[(2-甲基-5-硝基-1H-咪唑-1-基)甲基] -1,3,4-恶二唑-2-基硫基]乙酸]烷基酯(11),收率良好。酰肼9与取代的异硫氰酸酯反应生成1- [2-(2-甲基-5-硝基-1 H-咪唑-1-基)乙酰基] -4-芳基(或乙基)硫代氨基脲(12),其在酸性下环化N-取代的2-氨基-5-[(2-甲基-5-硝基-1H-咪唑-1-基)甲基]