Synthesis, characterization, in vitro DNA photocleavage and cytotoxicity studies of 4-arylazo-1-phenyl-3-(2-thienyl)-5-hydroxy-5-trifluoromethylpyrazolines and regioisomeric 4-arylazo-1-phenyl-5(3)-(2-thienyl)-3(5)-trifluoromethylpyrazoles
作者:Ranjana Aggarwal、Suresh Kumar、Ashwani Mittal、Rachna Sadana、Vikas Dutt
DOI:10.1016/j.jfluchem.2020.109573
日期:2020.8
1-(2-Thienyl)-2-arylazo-4,4,4-trifluorobutane-1,3-diones (4), generated by the condensation of aryldiazonium salts (2) with 4,4,4-trifluoro-1-(2-thienyl)butane-1,3-dione (3), were used as common intermediates to synthesize regioisomeric 4-arylazo-1-phenyl-5(3)-(2-thienyl)-3(5)-trifluoromethylpyrazoles (5 and 6) and 4-arylazo-1-phenyl-3-(2-thienyl)-5-hydroxy-5-trifluoromethylpyrazolines (7) by reacting
1-(2-噻吩基)-2-芳基偶氮-4,4,4-三氟丁烷-1,3-二酮(4),是由芳基重氮盐(2)与4,4,4-三氟-1-缩合生成的(2-噻吩基)丁烷-1,3-二酮(3)用作常见的中间体,以合成区域异构的4-芳基偶氮-1-苯基-5(3)-(2-噻吩基)-3(5)-三氟甲基吡唑(5和6)和4-芳基偶氮-1-苯基-3-(2-噻吩基)-5-羟基-5-三氟甲基吡唑啉(7)通过在中性条件下与苯肼反应。所有合成的化合物4,5,6和7在没有任何添加剂的情况下,在λmax 312 nm的紫外线辐射下,筛选pBR322超螺旋DNA质粒的DNA光裂解活性。结果表明3-三氟甲基异构体(5)比相应的5-三氟甲基吡唑(6)和5-羟基5-三氟甲基吡唑啉(7)更好地裂解质粒DNA 。4-(4-硝基苯基偶氮)-1-苯基-5-(2-噻吩基)-3-三氟甲基吡唑5g,显示了作为DNA光切割机的最佳潜力,将超螺旋质粒(Form-I