Synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-dione derivatives: assessment of their antimicrobial, antituberculosis and antioxidant activity
作者:Chetan B. Sangani、Jigar A. Makwana、Yong-Tao Duan、Nilesh J. Thumar、Meng-Yue Zhao、Yogesh S. Patel、Hai-Liang Zhu
DOI:10.1007/s11164-015-2138-7
日期:2016.3
A new series of pyrazolo[1,2-b]phthalazine derivatives (4a–p) bearing the 5-aryloxypyrazole nucleus was synthesized by one-pot, three-component, base-catalyzed cyclo condensation reaction of 3-methyl-5-aryloxy-1-aryl-1H-pyrazole-4-carbaldehyde (1a–d), malononitrile or ethyl cyanoacetate (2a–b) and 2,3-dihydro-1,4-phthalazinedione (3a–b) in ethanol containing an eco friendly base, NaOH, in good to excellent yields. All synthesized compounds (4a–p) were duly characterized by physico-chemical parameters, 1H NMR, 13C NMR, FT-IR and LCMS techniques. In vitro antimicrobial activity of the synthesized compounds was investigated against a representative panel of pathogenic strains. Compounds 4e, 4g, 4h, 4k and 4o exhibited excellent antimicrobial activity compared with first line drugs. In vitro antituberculosis activity was evaluated against Mycobacterium tuberculosis H37Rv, and compounds 4g and 4o emerged as the promising antimicrobial members with better antituberculosis activity. A brine shrimp bioassay was carried out to study the in vitro cytotoxic properties of the synthesized compounds. In vitro antioxidant activity was evaluated by the ferric-reducing antioxidant power method. Compounds 4c, 4d, 4g and 4h showed the highest antioxidant potencies.
通过一步法、三组分、碱催化的环缩合反应,以3-甲基-5-芳氧基-1-芳基-1H-吡唑-4-甲醛(1a–d)、丙二腈或氰乙酸乙酯(2a–b)和2,3-二氢-1,4-酞嗪二酮(3a–b)为原料,在含环保碱NaOH的乙醇中合成了含5-芳氧基吡唑核的一系列新型吡唑并[1,2-b]酞嗪衍生物(4a–p),产率良好至优秀。所有合成的化合物(4a–p)均通过物理化学参数、1H NMR、13C NMR、FT-IR和LCMS技术进行了适当表征。对合成的化合物进行了体外抗菌活性测试,针对一组有代表性的病原菌株进行了研究。与一线药物相比,化合物4e、4g、4h、4k和4o表现出优异的抗菌活性。体外抗结核活性针对结核分枝杆菌H37Rv进行了评估,化合物4g和4o作为有前景的抗菌成员,显示出更好的抗结核活性。通过盐水虾生物测定法研究了合成化合物的体外细胞毒性。通过铁还原抗氧化能力法评估了体外抗氧化活性。化合物4c、4d、4g和4h表现出最高的抗氧化活性。