AbstractIn previous studies, we synthesized different imidazo−pyrazoles 1 and 2 with interesting anticancer, anti‐angiogenic and anti‐inflammatory activities. To further extend the structure‐activity relationships of imidazo−pyrazole scaffold and to identify novel antiproliferative/anti‐inflammatory agents potentially active with multi‐target mechanisms, a library of compounds 3–5 has been designed and synthesized. The chemical modifications characterizing the novel derivatives include: i) decoration of the catechol ring with groups with different electronic, steric and lipophilic properties (compounds 3); ii) insertion of a methyl group on C‐6 of imidazo−pyrazole scaffold (compounds 4); iii) shift of the acylhydrazonic substituent from position 7 to 6 of the imidazo−pyrazole substructure (compounds 5). All synthesized compounds were tested against a panel of cancer and normal cell lines. Derivatives 3 a, 3 e, 4 c, 5 g and 5 h showed IC50 values in the low micromolar range against selected tumor cell lines and proved to have antioxidant properties, being able to inhibit ROS production in human platelet. In silico calculation predicted favourable drug‐like and pharmacokinetic properties for the most promising compounds. Furthermore, molecular docking and molecular dynamic simulations suggested the ability of most active derivative 3 e to interact with colchicine binding site in the polymeric tubulin α/tubulin β/stathmin4 complex.
摘要 在之前的研究中,我们合成了不同的咪唑吡唑 1 和 2,它们具有有趣的抗癌、抗血管生成和抗炎活性。为了进一步扩展咪唑吡唑支架的结构-活性关系,并鉴定具有多靶点机制的潜在活性的新型抗增殖/抗炎剂,我们设计并合成了化合物库 3-5。这些新型衍生物的化学修饰特征包括:i)用具有不同电子、立体和亲油特性的基团装饰儿茶酚环(化合物 3);ii)在咪唑吡唑支架的 C-6 上插入一个甲基(化合物 4);iii)将酰肼取代基从咪唑吡唑子结构的第 7 位移到第 6 位(化合物 5)。对所有合成的化合物都进行了癌症和正常细胞系的测试。衍生物 3 a、3 e、4 c、5 g 和 5 h 对所选肿瘤细胞系的 IC50 值均在较低的微摩尔范围内,并证明具有抗氧化特性,能够抑制人体血小板中 ROS 的产生。硅学计算预测,最有前途的化合物具有良好的类药物和药代动力学特性。此外,分子对接和分子动力学模拟表明,最有活性的衍生物 3 e 能够与聚合管蛋白 α/tubulin β/stathmin4 复合物中的秋水仙碱结合位点相互作用。