Abstract
A new series of twenty four derivatives of pyrano[3,2-c]chromene IVa-x bearing 1H-pyrazole were synthesized by a one pot, base-catalyzed cyclocondensation reaction of 1H-pyrazole-4-carbaldehyde Ia-l, malononitrile II and 4-hydroxycoumarin IIIa-b. All the synthesized compounds were characterized by elemental analysis, FT-IR, 1H NMR and 13C NMR spectral data. All the synthesized compounds were screened against six bacterial pathogens, namely B. subtilis, C. tetani, S. pneumoniae, S. typhi, V. cholerae, E. coli and for antifungal activity against two fungal pathogens, A. fumigatus and C. albicans using the broth microdilution MIC method. Some of the compounds were found to be equipotent or more potent than commercial drugs against most of employed strains, as evident from the screening data.
摘要:通过一锅法,以1H-吡唑-4-甲醛 Ia-l、丙二腈 II 和 4-羟基香豆素 IIIa-b 为原料,通过碱催化的环缩合反应合成了一系列新的带有1H-吡唑的吡喃[3,2-c]色素 IVa-x 衍生物。所有合成的化合物均通过元素分析、傅立叶变换红外光谱、质子核磁共振和碳-13核磁共振谱数据进行了表征。所有合成的化合物均对六种细菌病原体进行了筛选,包括枯草芽孢杆菌、气性破伤风杆菌、肺炎链球菌、伤寒沙门氏菌、霍乱弧菌、大肠杆菌,以及对两种真菌病原体,曲霉和白念珠菌,进行了抗真菌活性测试,使用了微量肉汤稀释最小抑制浓度(MIC)方法。一些化合物被发现对大多数菌株具有与商业药物相当或更强的作用,这一点可以从筛选数据中看出。