Synthesis and biological evaluation of 1-substituted-3(5)-(6-methylpyridin- 2-yl)-4-(quinolin-6-yl)pyrazoles as transforming growth factor-β type 1 receptor kinase inhibitors

Abstract

A series of 1-substituted-3(5)-(6-methylpyridin-2-yl)-4-(quinolin-6-yl) pyrazoles 14a-e, 15a-e, 17a-c, and 18a-d have been synthesized and evaluated for their ALK5 inhibitory activity in an enzyme assay and in a cell-based luciferase reporter assay. The 6-quinolinyl pyrazole analogue 14b inhibited ALK5 phosphorylation with IC 50 value of 0.022 μM and showed 84% inhibition at 0.1 μM in a luciferase reporter assay using HaCaT cells permanently transfected with p3TP-luc reporter construct. © 2011 Elsevier Ltd. All rights reserved.