Synthesis andIn Vitro Antibacterial Evaluation of Novel Imidazo[2′, 1′:5, 1]-1, 2, 4-triazolo[4, 3-c]-quinazoline Derivatives of 5-Thioxo-1, 2, 4-triazole, 4-Oxothiazolidine, and their Open-chain Counterparts
作者:Magda N. Nasr、Magdy M. Gineinah、Eman R. El-Bendary
DOI:10.1002/ardp.200300809
日期:2003.12
synthesized from corresponding thiosemicarbazide derivatives, 5a—f. The stepwise methodology applied to the preparation of compounds 5a—f was initiated with reaction of the parent 3‐amino‐1, 2, 4‐triazolo[4, 3‐c]quinazolines, 2, with ethyl 2‐chloroacetoacetate resulting in annelation of the imidazole ring to give esters, 3a—c. However, hydrazinolysis of these ester derivatives gave the corresponding acid
两个新型系列咪唑[2', 1': 5, 1] -1, 2, 4-triazolo [4, 3-c] 喹唑啉类化合物,带有5-thioxo-1, 2, 4-triazoles, 6a-f和 4-氧代噻唑烷,7a-f,由相应的氨基硫脲衍生物 5a-f 合成。用于制备化合物 5a-f 的逐步方法开始于母体 3-氨基-1, 2, 4-三唑并 [4, 3-c] 喹唑啉 2 与 2-氯乙酰乙酸乙酯的反应,导致咪唑环生成酯,3a-c。然而,这些酯衍生物的肼解得到相应的酰肼 4a-c,其与合适的异硫氰酸烷基酯反应生成化合物 5a-f。依次将化合物 5 与氢氧化钾或溴乙酸乙酯环化,分别得到相应的硫代三唑 6 和氧噻唑烷 7。筛选所有合成的化合物对各种革兰氏阳性和革兰氏阴性细菌的体外抗菌活性。发现一些测试化合物具有有效的抗菌活性。化合物 7f 对两种类型的细菌,尤其是革兰氏阳性菌表现出比参考标准品环丙沙星高得多的效力。