Antimicrobial studies of some novel quinazolinones fused with [1,2,4]-triazole, [1,2,4]-triazine and [1,2,4,5]-tetrazine rings
作者:Sarvesh Kumar Pandey、Abhishek Singh、Ashutosh Singh、Nizamuddin
DOI:10.1016/j.ejmech.2008.05.033
日期:2009.3
afforded the fused system (4), while reaction of (3) with isatin in methanol gave the corresponding Schiff base (7) which on cyclodehydration furnished another fused heterocyclic system (8). The intermediate (3) on refluxing with substituted-phenylisothiocyanate gave the substituted-thiosemicarbazide (5), which on oxidative cyclization with bromine in CCl4 furnished the novel fused system (6). The structures
三个系列的新的和新的稠合杂环系统,即。三唑并[4,3 - a ]-喹唑啉-7-ones(4),[1,2,4,5 ]-四嗪[4,3 - a ]-喹唑啉-8-ones(6)和吲哚[2, 3- ç ] [1,2,4] -triazino [4,3-一个] -喹唑啉-8-酮(8)已经从关键中间体3-(取代苯基)合成-2-肼基-喹唑啉4个(3)。因此,在二氯甲烷中,在DCC存在下,(3)与适当的芳族酸缩合,得到稠合体系(4),而(3)与靛红在甲醇中的反应得到相应的席夫碱(7)。),其在脱水后提供了另一个稠合杂环系统(8)。中间体(3)与取代的苯基异硫氰酸酯一起回流,得到取代的硫代氨基脲(5),其在溴在CCl 4中的氧化环化后提供了新颖的稠合体系(6)。中间体和最终化合物的结构已通过IR,1 H NMR,13 C NMR,UV和元素分析确定。已筛选出所有合成的化合物对革兰氏阴性菌,大肠杆菌,铜绿假单胞