title: The 5-substituted piperazine as a novel secondary pharmacophore greatly improving the physical properties of urea-based inhibitors of soluble epoxide hydrolase.
abstract: The inhibition of the mammalian soluble epoxide hydrolase (sEH) is a promising new therapy in the treatment of hypertention and inflammation. The problems of limited water solubility and high melting points commonly displayed by the active 1,3-disubstituted ureas prevent the further development of potent urea-based sEH inhibitors. Therefore, a new class of potent inhibitors of sEH were designed and synthesized by the introduction of a polar constrained piperazino group in the right side of adasmantyl urea to increase the water solubility. A facile and general synthesis was established to prepare a series of 1-adamantan-1-yl-3-(2-piperazin-2-yl-ethyl)-ureas (1a-d) with various 5-substitutions on the 2-piperazino ring, which will advance the SAR study by the efficient making of structurally diverse analogs. The effect of the 5-substitution on the activity and the water solubility was examined. The best potency was exhibited by the 5-benzyl-substituted-piperazine-containing urea with an IC50 value of 1.37 microM against human sEH and good water solubility (S=7.46 mg/mL) and low melting point, in which the 5-substituted piperazine serves as a favorable secondary pharmacophore and a water-solubility enhancing group. Our present work provides a promising new template for the design of orally available therapeutic agents for the disorders that can be addressed by changing the in vivo concentration of the chemical mediators that contain an epoxide.
authors.affiliation: State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China.
authors.forename: Hui-Yuan
authors.initials: HY
authors.lastname: Li
authors.forename: Yi
authors.initials: Y
authors.lastname: Jin
authors.forename: Christophe
authors.initials: C
authors.lastname: Morisseau
authors.forename: Bruce D
authors.initials: BD
authors.lastname: Hammock
authors.forename: Ya-Qiu
authors.initials: YQ
authors.lastname: Long
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004791:Enzyme Inhibitors / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D004851:Epoxide Hydrolases / Q000037:antagonists & inhibitors*; D006801:Humans; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy; D010879:Piperazines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D021241:Spectrometry, Mass, Electrospray Ionization; D013329:Structure-Activity Relationship; D014508:Urea / Q000737:chemistry*
chemical_list: D004791:Enzyme Inhibitors; D007202:Indicators and Reagents; D010879:Piperazines; D014508:Urea; D004851:Epoxide Hydrolases