Disclosed are indazole compounds and derivatives thereof for use as modulators of the activity of mitogen-activated protein kinase 4 (MEK4). The disclosed compounds include 3-Arylindazoles which may be formulated in pharmaceutical composition for treating cell proliferative diseases and disorders associated with MEK4 activity, including cancer.
Previously, ethyl 4-(1-benzyl-1H-indazol-3-yl)benzoate (YD-3) was identified by us as the first non-peptide protease-activated receptor 4 (PAR4) antagonist. To continue on our development of novel anti-PAR4 agents, YD-3 was used as a lead compound and a series of its derivatives were synthesized and evaluated for their selective anti-PAR4 activity. Through structure-activity relationship (SAR) study, we identified the important functional groups contributing to anti-PAR4 activity, and these functional groups were kept intact during subsequent structural modification. Several new compounds with anti-PAR4 activity comparable to YD-3 were identified. Among them, ethyl 4-[1-(3-chlorobenzyl)-1H-indazol-3-yl]benzoate (33) showed the most potent inhibitory effect on PAR4-mediated platelet aggregation, ATP release, and P-selectin expression. On the other hand, ethyl 4-(1-phenyl-1H-indazol-3-yl)benzoate (83) exhibited dual inhibitory effects on PAR4 and thromboxane formation from arachidonic acid. The above findings can be used as guidelines for development of novel antiplatelet drug candidates. (c) 2008 Published by Elsevier Ltd.
Synthesis and Biological Evaluation of 3‐Arylindazoles as Selective MEK4 Inhibitors
作者:Kristine K. Deibler、Gary E. Schiltz、Matthew R. Clutter、Rama K. Mishra、Purav P. Vagadia、Matthew O'Connor、Mariam Donny George、Ryan Gordon、Graham Fowler、Raymond Bergan、Karl A. Scheidt
DOI:10.1002/cmdc.201900019
日期:2019.3.22
Herein we report the discovery of a novel series of highly potent and selective mitogen-activated protein kinase kinase 4 (MEK4) inhibitors. MEK4 is an upstream kinase in MAPK signaling pathways that phosphorylates p38 MAPK and JNK in response to mitogenic and cellular stress queues. MEK4 is overexpressed and induces metastasis in advanced prostate cancer lesions. However, the value of MEK4 as an oncology