Identification of 4,5-Dihydro-1H-pyrazolo[4,3-h]quinazoline Derivatives as a New Class of Orally and Selective Polo-Like Kinase 1 Inhibitors
摘要:
Polo-like kinase 1 (Plk1) is a fundamental regulator of mitotic progression whose overexpression is often associated with oncogenesis and therefore is recognized as an attractive therapeutic target in the treatment of proliferative diseases. Here we discuss the structure-activity relationship of the 4,5-dihydro-1H-pyrazolo[4,3-h]quinazoline class of compounds that emerged from a high throughput screening (HTS) campaign as potent inhibitors of Plk1 kinase. Furthermore, we describe the discovery of 49, 8-{[2-methoxy-5-(4-methylpiperazin-1-yl)phenyl]amino}-1-methyl-4,5-dihydro-1H-pyrazolo-[4,3-h]quinazoline-3-carboxamide, as a highly potent and specific ATP mimetic inhibitor of Plk1 (IC(50) = 0.007 mu M) as well as its crystal structure in complex with the methylated Plk1(36-345) construct. Compound 49 was active in cell proliferation against different tumor cell lines with 1050 values in the submicromolar range and active in vivo in the HCT116 xenograft model where it showed 82% tumor growth inhibition after repeated oral administration.
Pyrazolo-Quinazoline Derivatives, Process for Their Preparation and Their Use as Kinase Inhibitors
申请人:Traquandi Gabriella
公开号:US20090124605A1
公开(公告)日:2009-05-14
Pyrazolo-quinazoline derivatives of formula (Ia) or (Ib) as defined in the specification, and pharmaceutically acceptable salts thereof, process for their preparation and pharmaceutical compositions comprising them are disclosed; the compounds of the invention may be useful, in therapy, in the treatment of diseases associated with a disregulated protein kinase activity, like cancer.
[EN] PROTEIN KINASE INHIBITOR, PREPARATION METHOD THEREFOR, AND APPLICATION THEREOF<br/>[FR] INHIBITEUR DE PROTÉINE KINASE, SON PROCÉDÉ DE PRÉPARATION ET SON APPLICATION<br/>[ZH] 蛋白激酶抑制剂及其制备方法和应用