Fms-like receptor tyrosine kinase 3 (FLT3) has been emerging as an attractive target for the treatment of acute myeloid leukemia (AML). By modifying the structure of FN-1501, a potent FLT3 inhibitor, 24 novel 1H-pyrazole-3-carboxamide derivatives were designed and synthesized. Compound 8t showed strong activity against FLT3 (IC50: 0.089 nM) and CDK2/4 (IC50: 0.719/0.770 nM), which is more efficient than FN-1501(FLT3, IC50: 2.33 nM; CDK2/4, IC50: 1.02/0.39 nM). Compound 8t also showed excellent inhibitory activity against a variety of FLT3 mutants (IC50 < 5 nM), and potent anti-proliferative effect within the nanomolar range on acute myeloid leukemia (MV4-11, IC50: 1.22 nM). In addition, compound 8t significantly inhibited the proliferation of most human cell lines of NCI60 (GI50 < 1 μM for most cell lines). Taken together, these results demonstrated the potential of 8t as a novel compound for further development into a kinase inhibitor applied in cancer therapeutics.
Fms-like受体酪氨酸激酶3(FLT3)已经成为治疗急性髓系白血病(AML)的一个吸引人的靶点。通过修改FN-1501的结构,设计并合成了24个新的1H-吡唑-3-羧酰胺衍生物。化合物8t对FLT3(IC50:0.089 nM)和CDK2/4(IC50:0.719/0.770 nM)表现出强大的活性,比FN-1501(FLT3,IC50:2.33 nM;CDK2/4,IC50:1.02/0.39 nM)更有效。化合物8t还对多种FLT3突变体显示出优秀的抑制活性(IC50 < 5 nM),并在纳摩尔级范围内对急性髓系白血病(MV4-11,IC50:1.22 nM)显示出强效的抗增殖作用。此外,化合物8t显著抑制了NCI60中大多数人类细胞系的增殖(对大多数细胞系的GI50 < 1 μM)。综合这些结果表明,8t具有潜力作为一种新型化合物,进一步开发成为应用于癌症治疗的激酶抑制剂。