possible modification site for improving the potency. On the basis of this insight, bioisosteric replacement of the ester with amide linkage and changing the ethyl substituent to hydrophobic 3-acetamidophenyl ring led to the identification of 12w with a ∼450-fold improved Aurora kinase A inhibition potency (IC50 = 33 nM), compared to 8a. Compound 12w showed selective inhibition of Aurora A kinase over Aurora
极光激酶已成为设计抗癌药物的诱人靶标。通过基于结构的虚拟筛选,新型吡唑命中8a被鉴定为Aurora激酶A抑制剂(IC 50 = 15.1μM)。与Aurora A蛋白复合的8a的X射线共晶体结构表明,C-4位羧酸乙酯侧链可能是提高效价的可能修饰位点。根据这种见解,酯的酰胺键被生物等位取代,并将乙基取代基改变为疏水性的3-乙酰氨基苯环,导致鉴定出12w的Aurora激酶A抑制能力提高了约450倍(IC 50 = 33 nM ),与8a相比。化合物12w显示了Aurora A激酶相对于Aurora B / C的选择性抑制,这可能是由于3-乙酰氨基与Aurora A非保守的Thr217残基之间存在独特的H键相互作用,Aurora B / C中的Glu是Glu在建模研究中发现与3-acetamido组发生空间冲突。