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Structure–Activity Relationship Studies of Pyrazolo[3,4-d]pyrimidine Derivatives Leading to the Discovery of a Novel Multikinase Inhibitor That Potently Inhibits FLT3 and VEGFR2 and Evaluation of Its Activity against Acute Myeloid Leukemia in Vitro and in Vivo

Journal of Medicinal Chemistry2013Vol. 56(4), pp. 1641–1655

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Lingling Yang, Guo‐Bo Li, Shuang Ma, Chan Zou, Shu Zhou, Qizheng Sun, Chuan Cheng, Xin Chen, Lijiao Wang, Shan Feng, Linli Li, Shengyong Yang

Abstract

We describe the structural optimization of a hit compound, 1-(4-(1H-pyrazolo[3,4-d]pyrimidin-4-ylamino)phenyl)-3-(3-methoxyphenyl)urea (1), which exhibits inhibitory activity but low potency against FLT3 and VEGFR2. A series of pyrazolo[3,4-d]pyrimidine derivatives were synthesized, and structure-activity relationship analysis using cell- and transgenic-zebrafish-based assays led to the discovery of a number of compounds that exhibited both high potency against FLT3-driven human acute myeloid leukemia (AML) MV4-11 cells and a considerable antiangiogenic effect in transgenic-zebrafish-based assays. The compound 1-(4-(1H-pyrazolo[3,4-d]pyrimidin-4-yloxy)phenyl)-3-(4-chloro-3-(trifluoromethyl)phenyl)urea (33), which exhibited the highest activity in preliminary in vivo anti-AML assays, was chosen for further anti-AML studies. The results demonstrated that compound 33 is a multikinase inhibitor that potently inhibits FLT3 and VEGFR2. In an MV4-11 xenograft mouse model, a once-daily dose of compound 33 at 10 mg/kg for 18 days led to complete tumor regression without obvious toxicity. Western blot and immunohistochemical analyses were performed to determine the mechanism of action of compound 33.

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Abstract

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