Fibroblast growth-factor receptor (FGFR) is a potential target for cancer therapy. We designed three novel series of FGFR1 inhibitors bearing indazole, benzothiazole, and 1H-1,2,4-triazole scaffold via fragment-based virtual screening. All the newly synthesised compounds were evaluated in vitro for their inhibitory activities against FGFR1. Compound 9d bearing an indazole scaffold was first identified as a hit compound, with excellent kinase inhibitory activity (IC50 = 15.0 nM) and modest anti-proliferative activity (IC50 = 785.8 nM). Through two rounds of optimisation, the indazole derivative 9 u stood out as the most potent FGFR1 inhibitors with the best enzyme inhibitory activity (IC50 = 3.3 nM) and cellular activity (IC50 = 468.2 nM). Moreover, 9 u also exhibited good kinase selectivity. In addition, molecular docking study was performed to investigate the binding mode between target compounds and FGFR1.

中文翻译：

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通过基于片段的虚拟筛选，设计和合成新型1H-1,2,4-三唑，苯并噻唑和吲唑基衍生物，作为有效的FGFR1抑制剂。

成纤维细胞生长因子受体（FGFR）是癌症治疗的潜在靶标。通过基于片段的虚拟筛选，我们设计了三种新型的带有吲唑，苯并噻唑和1H-1,2,4-三唑支架的FGFR1抑制剂。在体外评估所有新合成的化合物对FGFR1的抑制活性。首先将带有吲唑支架的化合物9d鉴定为具有优良激酶抑制活性（IC50 = 15.0 nM）和适度的抗增殖活性（IC50 = 785.8 nM）的命中化合物。通过两轮优化，吲唑衍生物9 u是最强的FGFR1抑制剂，具有最佳的酶抑制活性（IC50 = 3.3 nM）和细胞活性（IC50 = 468.2 nM）。此外，9 u还表现出良好的激酶选择性。此外，