Symmetric adamantyl-diureas as soluble epoxide hydrolase inhibitors

A series of inhibitors of the soluble epoxide hydrolase (sEH) containing two urea groups has been developed. Inhibition potency of the described compounds ranges from 2.0 mu M to 0.4 nM. 1,6-(Hexamethylene)bis[(adamant-1-yl) urea] (3b) was found to be a potent slow tight binding inhibitor (IC50 = 0.5 nM) with a strong binding to sEH (K-i = 3.1 nM) and a moderately long residence time on the enzyme (k(off) = 1.05 x 10(-3) s(-1); t(1/2) = 11 min). (C) 2014 Elsevier Ltd. All rights reserved.