Pyrazole derivatives as new potent and selective 20-hydroxy-5,8,11,14-eicosatetraenoic acid synthase inhibitors

Improvement of the physical properties of pyrazole derivative 1, which we reported previously as a potent and selective 20-HETE synthase inhibitor (IC50 5.7nM), is described. Introduction of a sufficient substituted-amino group on the side chain enhanced the water-solubility of 1 (0.014mg/mL at pH6.8). Among the products, 2-piperazinoethoxy derivatives 3e and 6b showed solubility suitable for injection and potent inhibitory activity toward 20-HETE synthase (IC50 21.2 and 14.0 nM, respectively). (C) 2004 Elsevier Ltd. All rights reserved.