Synthesis and antimicrobial activities of some new biheterocyclic compounds containing 1,2,4-triazol-3-one and 1,3,4-thiadiazole moieties
作者:AHMET DEMİRBAŞ、NESLİHAN DEMİRBAŞ、HAKAN BEKTAŞ、HACER BAYRAK、ŞENGÜL ALPAY KARAOĞLU
DOI:10.3906/kim-0909-271
日期:——
2-(4-Amino-3-(4-chlorophenyl)-5-oxo-4,5--dihydro-1H-1,2,4-triazol- 1-yl)-N'-[(2,6-dihalogenophenyl)-methylene]acetohydrazides (3a,b) was obtained via the formation of 2-(4-amino-3-(4-chlorophenyl)-5-oxo-4,5- dihydro-1H-1,2,4-triazol-1-yl)acetohydrazide (2), which was obtained starting from 4-amino-5-(4-chlo\-rophenyl)-2,4-dihydro-3H-1,2,4-triazol-3-one (1) in 2 steps. 2-[4-amino-3-(4-chlorophenyl)-5-oxo-4,5--dihydro-1H- 1,2,4-triazol-1-yl]acetyl}-N-phenylhydra-zine carbothioamide (4), which was prepared starting from 2, was converted to the corresponding 1,3,4-thiadiazole derivative (5) in acidic media. Moreover, the basic treatment of 4 resulted in the formation of 4-amino-5-(4-chlorophenyl)- 2-[(4-phenyl-5-thioxo-4,5-dihydro-1H-1,2,4-triazol-3-yl)methyl]-2,4- dihydro-3H-1,2,4-triazol-3-one (7). The reactions of compounds 5 and 7 with methyl iodide in the presence of sodium ethoxide afforded the corresponding N-methyl (6) and S-methyl (8) derivatives, respectively. The synthesis of Mannich bases (10a and 10b) was performed from the reaction of 7 with morpholine or piperazine in the presence of formaldehyde. All the newly synthesized compounds were screened for their antimicrobial activity. The antimicrobial activity study revealed that compounds 3a, 3b, and 5 showed good antimicrobial activities against the test microorganisms as compared with ampicillin.
2-(4-氨基-3-(4-氯苯基)-5-氧代-4,5-二氢-1H-1,2,4-三唑-1-基)-N'-[(2,6-二卤素苯基)-亚甲基]乙酰肼(3a,b)是由 2-(4-氨基-3-(4-氯苯基)-5-氧代-4,5-二氢-1H-1,2,4-三唑-1-基)乙酰肼(2)生成的、5-二氢-1H-1,2,4-三唑-1-基)乙酰肼(2),该乙酰肼由 4-氨基-5-(4-氯苯基)-2,4-二氢-3H-1,2,4-三唑-3-酮(1)分两步获得。由 2 开始制备的 2-[4-氨基-3-(4-氯苯基)-5-氧代-4,5-二氢-1H-1,2,4-三唑-1-基]乙酰基}-N-苯肼硫代甲酰胺(4)在酸性介质中转化为相应的 1,3,4-噻二唑衍生物(5)。 此外,对 4 进行碱处理后可生成 4-氨基-5-(4-氯苯基)-2-[(4-苯基-5-硫酮-4,5-二氢-1H-1,2,4-三唑-3-基)甲基]-2,4-二氢-3H-1,2,4-三唑-3-酮(7)。 化合物 5 和 7 在乙醇钠存在下与碘甲烷反应,分别得到相应的 N-甲基(6)和 S-甲基(8)衍生物。曼尼希碱(10a 和 10b)是由 7 与吗啉或哌嗪在甲醛存在下反应合成的。 对所有新合成的化合物进行了抗菌活性筛选。 抗菌活性研究表明,与氨苄西林相比,化合物 3a、3b 和 5 对测试微生物具有良好的抗菌活性。