In this study, simple, easy and convenient syntheses of six novel 4-thiazolidinone derivatives (3a-f) bearing benzofuran, quinoline and pyrazole moieties have been described. In the first step, six different carbohydrazides (2a-f) were synthesized by reacting 5-(benzofuran-2-yl)-1-phenyl-1H-pyrazole-3-carbohydrazide (2) with six different 2-(p-tolyloxy)quinoline-3-carbaldehyde (1a-f). Similarly, in second step, 5-(benzofuran-2-yl)-N¢-(2-(2-(p-tolyloxy) substituted quinolin-3-yl)-4-oxothiazolidin-3-yl)-1-phenyl-1H-pyrazole-3-carboxamide (3a-f) was prepared in excellent yield through the interaction of compounds 2a-f with thioglycolic acid in presence of anhydrous zinc chloride. Structural identifications of products 2a and 3a are reported on the basis of IR, 1H NMR, 13C NMR and mass spectra and the analytical data confirms the structure of title compounds. Further, these new products have been assayed for their antimicrobial screening against S. aureus and E. coli as the two selected bacterial strains and two fungi such as C. albicans and A. niger using paper disc diffusion method. Antimicrobial screening revealed that the compounds are good antibacterial agents but found to be inactive against fungi.
本研究描述了六种含有
苯并呋喃、
喹啉和
吡唑分子的新型 4-
噻唑烷酮衍
生物(3a-f)的简单、容易和方便的合成方法。第一步,通过 5-(
苯并呋喃-2-基)-1-苯基-1H-
吡唑-3-甲酰
肼(2)与六种不同的 2-(对聚氧)
喹啉-3-
甲醛(1a-f)反应,合成了六种不同的甲酰
肼(2a-f)。同样,在第二步中,化合物 2a-f 与
硫代
乙醇酸在无
水氯化锌存在下发生作用,制备出 5-(
苯并呋喃-2-基)-N¢-(2-(2-(对聚氧)取代的
喹啉-3-基)-4-氧代
噻唑啉-3-基)-1-苯基-1H-
吡唑-3-甲酰胺(3a-f),收率极高。根据红外光谱、1H NMR、13C NMR 和质谱报告了产物 2a 和 3a 的结构鉴定,分析数据证实了标题化合物的结构。此外,这些新产品还采用纸片扩散法对
金黄色葡萄球菌和大肠杆菌这两种选定细菌菌株以及白僵菌和黑僵菌这两种真菌进行了抗菌筛选。抗菌筛选结果表明,这些化合物是很好的抗菌剂,但对真菌没有活性。