Tri- and Tetrasubstituted Pyrazole Derivates: Regioisomerism Switches Activity from p38MAP Kinase to Important Cancer Kinases
作者:Bassam Abu Thaher、Martina Arnsmann、Frank Totzke、Jan E. Ehlert、Michael H. G. Kubbutat、Christoph Schächtele、Markus O. Zimmermann、Pierre Koch、Frank M. Boeckler、Stefan A. Laufer
DOI:10.1021/jm201391u
日期:2012.1.26
In the course of searching for new p38 alpha MAP kinase inhibitors, we found that the regioisomeric switch from 3-(4-fluorophenyl)-4-(pyridin-4-yl)-1-(aryl)-1H-pyrazol-5-amine to 4-(4-fluorophenyl)-3-(pyridin-4-yl)-1-(aryl)-1H-pyrazol-5-amine led to an almost complete loss of p38a inhibition, but they showed activity against important cancer kinases. Among the tested derivatives, 4-(4-fluorophenyl)-3-(pyridin-4-yl)-1-(2,4,6-trichlorophenyl)-1H-pyrazol-S-amine (6a) exhibited the best activity, with IC50 in the nanomolar range against Src, B-Raf wt, B-Raf V600E, EGFRs, and VEGFR-2, making it a good lead for novel anticancer programs.