作者:Ameya Chavan、Nandini Pai
DOI:10.3390/12112467
日期:——
2-Aminobenzothiazole-6-carboxylic acid (1), on condensation with chloroacetylchloride yielded 2-(2-chloroacetylamino)benzothiazole-6-carboxylic acid (2), which onamination with hydrazine hydrate yielded in turn 2-(2-hydrazinoacetylamino)benzo-thiazole-6-carboxylic acid (3). Compound 3, on condensation with various aromaticaldehydes afforded a series of 2-2-[N’-(arylidene)hydrazino]acetylamino}benzothiazole-6-carboxylic acids 4a-h, which upon dehydrative annulation in the presence ofchloroacetyl chloride and triethylamine yielded 2-2-[3-chloro-2-(aryl)-4-oxoazetidin-1-ylamino]-acetylamino}benzothiazole-6-carboxylic acids 5a-h. The synthesized compounds4a-h and 5a-h were screened for their antibacterial activity against four microorganisms:Staphylococcus aureus (Gram positive), Bacillus subtilis (Gram positive), Psuedomonasaeruginosa (Gram negative) and Escherichia coli (Gram negative). They were found toexhibit good to moderate antibacterial activity. The antifungal activity of these compoundswere also tested against three different fungal species. None of them were active againstthe species tested.
2-氨基苯并噻唑-6-羧酸(1)与氯乙酰氯缩合生成2-(2-氯乙酰氨基)苯并噻唑-6-羧酸(2),后者与水合肼反应生成2-(2-肼基乙酰氨基)苯并噻唑-6-羧酸(3)。化合物3与多种芳香醛缩合生成一系列2-2-[N’-(芳基)肼基]乙酰氨基}苯并噻唑-6-羧酸(4a-h),后者在氯乙酰氯和三乙胺存在下脱水环合生成2-2-[3-氯-2-(芳基)-4-氧代氮杂环丁烷-1-基氨基]乙酰氨基}苯并噻唑-6-羧酸(5a-h)。合成的化合物4a-h和5a-h被筛选用于对抗四种微生物的抗菌活性:金黄色葡萄球菌(革兰氏阳性)、枯草芽孢杆菌(革兰氏阳性)、绿脓杆菌(革兰氏阴性)和大肠杆菌(革兰氏阴性)。它们表现出良好至中等的抗菌活性。这些化合物的抗真菌活性也针对三种不同的真菌进行了测试。它们对测试的