Article
作者: Li, Kexue ; Zhao, Xiaoning ; Eksterowicz, John ; McMinn, Dustin L. ; Li, Cong ; Medina, Julio C. ; Wehn, Paul M. ; Deignan, Jeffrey T. ; Pattabiraman, Kanaka ; Fan, Pingchen ; Mihalic, Jeffrey T. ; Kaizerman, Jacob ; Li, Yunxiao ; Cho, Robert ; Lively, Sarah E. ; Weidner, Margaret F. ; McGee, Lawrence R. ; Alba, Grace Q. ; Wang, Zhulun ; Fu, Jiasheng ; Fisher, Benjamin ; Zhang, Alex J. ; Ma, Ji ; Ragains, Mark L. ; Suchomel, Julia ; Chen, Ada ; Li, Zhihong ; Dai, Kang ; Keegan, Kathleen S. ; Piper, Derek E. ; Chen, Xiaoqi ; Ngo, Rachel ; Huard, Justin N. ; Ayres, Merrill ; Liu, Wen ; Wanska, Malgorzata ; DeGraffenreid, Michael ; Gribble, Michael W. ; Modi, Kriti ; Thibault, Steve ; Wang, Xianghong ; Carlson, Timothy J. ; Kamb, Alexander ; Walker, Nigel ; Wang, Xiaodong ; Queva, Christophe ; Liang, Lingming ; Lo, Mei-Chu ; Wickramasinghe, Dineli ; Connors, Richard V. ; Duquette, Jason
We describe the structural optimization of a lead compound 1 that exhibits dual inhibitory activities against FLT3 and CDK4. A series of pyrido[4',3':4,5]pyrrolo[2,3-d]pyrimidine derivatives was synthesized, and SAR analysis, using cell-based assays, led to the discovery of 28 (AMG 925), a potent and orally bioavailable dual inhibitor of CDK4 and FLT3, including many FLT3 mutants reported to date. Compound 28 inhibits the proliferation of a panel of human tumor cell lines including Colo205 (Rb(+)) and U937 (FLT3(WT)) and induced cell death in MOLM13 (FLT3(ITD)) and even in MOLM13 (FLT3(ITD, D835Y)), which exhibits resistance to a number of FLT3 inhibitors currently under clinical development. At well-tolerated doses, compound 28 leads to significant growth inhibition of MOLM13 xenografts in nude mice, and the activity correlates with inhibition of STAT5 and Rb phosphorylation.