Preparation and antimicrobial activity evaluation of some quinoline derivatives containing an azole nucleus
作者:MUHAMMET ÖZYANIK、SERPİL DEMİRCİ、HAKAN BEKTAŞ、NESLİHAN DEMİRBAŞ、AHMET DEMİRBAŞ、ŞENGÜL ALPAY KARAOĞLU
DOI:10.3906/kim-1109-9
日期:——
Quinoline-2-carbohydrazide (2) obtained from quinaldic acid (1) was converted to the corresponding carbothioamide 3 and carboxamide 6 by treatment with benzyliso(thio)cyanate. The basic treatment of 3 and 6 yielded the corresponding 1,2,4-triazole derivatives 4 and 7. The synthesis of 5-(quinolin-2-yl)-1,3,4- oxadiazol-2-thiol (9) was performed from the reaction of 1 with CS_2 in basic media. The Mannich reaction of compounds 4, 7, and 9 resulted in the formation of aminoalkylated derivatives 5a-c, 8, and 10a,b. The condensation of 1 with thiosemicarbazide, carbohydrazide, or thiocarbohydrazide gave the corresponding 1,2,4-triazole derivatives (11-13). The treatment of 4-amino-5-(quinolin-2-yl)- 4H-1,2,4-triazole-3-thiol (13) with 4-chlorophenacyl bromide caused the formation of fused triazolothiadiazine 14. The condensation of 13 with 4-methoxybenzaldehyde generated the corresponding Schiff base 15. The newly synthesized compounds were characterized by elemental analyses, IR, ^1H-NMR, ^13}C-NMR, and mass spectra. The antimicrobial activity study revealed that some of the newly synthesized compounds showed good to moderate activity against a variety of microorganisms.
由喹哪啶酸(1)获得的喹啉-2-碳酰肼(2)通过用异(硫代)氰酸苄酯处理转化为相应的硫代甲酰胺3和甲酰胺6。 3和6的碱性处理得到相应的1,2,4-三唑衍生物4和7。5-(喹啉-2-基)-1,3,4-恶二唑-2-硫醇(9)的合成为由1与CS_2在基本介质中的反应进行。 化合物4、7和9的曼尼希反应导致形成氨烷基化衍生物5a-c、8和10a、b。 1与氨基硫脲、碳酰肼或硫代碳酰肼缩合得到相应的1,2,4-三唑衍生物(11-13)。 用4-氯苯甲酰溴处理4-氨基-5-(喹啉-2-基)-4H-1,2,4-三唑-3-硫醇(13)导致形成稠合三唑并噻二嗪14。13的缩合与4-甲氧基苯甲醛反应生成相应的席夫碱15。新合成的化合物通过元素分析、IR、^1H-NMR、^13}C-NMR和质谱进行表征。抗菌活性研究表明,一些新合成的化合物对多种微生物表现出良好至中等的活性。