Identification of novel benzimidazole series of potent and selective ORL1 antagonists
摘要:
Structure-activity studies on benzimidazole lead 1 obtained from library screening led to the discovery of potent and selective ORL1 antagonist 28, 5-chloro-2-[(1-ethyl-1-methylpropyl) thio]-6-[4-(2-hydroxyethyl) piperazin-1-yl]-1H-benzimidazole, which is structurally distinct from conventional non-peptide antagonists known to date. (C) 2008 Elsevier Ltd. All rights reserved.
2-Cyclohexylcarbonylbenzimidazoles as potent, orally available and brain-penetrable opioid receptor-like 1 (ORL1) antagonists
摘要:
The synthesis and biological evaluation of new potent opioid receptor-like 1 (ORL1) antagonists are presented. Conversion of the thioether linkage of the prototype [It is reported prior to this communication as a consecutive series.: Kobayashi, K.; Kato, T.; Yamamoto, I.; Shimizu, A.; Mizutani, S.; Asai, M.; Kawamoto, H.; Ito, S.; Yoshizumi, T.; Hirayama, M.; Ozaki, S.; Ohta, H.; Okamoto, O. Bioorg. Med. Chem. Lett., in press] to the carbonyl linker effectively reduces susceptibility to P-glycoprotein (P-gp) efflux. This finding led to the identification of 2-cyclohexylcarbonylbenzimizole analogue 7c, which exhibited potent ORL1 activity, excellent selectivity over other receptors and ion channels, and poor susceptibility to P-gp. Compound 7c also showed satisfactory pharmacokinetic profiles and brain penetrability in laboratory animals. Furthermore, 7c showed good in vivo antagonism. Hence, 7c was selected as a clinical candidate for a brain-penetrable ORL1 antagonist. (C) 2009 Elsevier Ltd. All rights reserved.
[EN] CYANO-SUBSTITUTED PYRIDINE AND CYANO-SUBSTITUTED PYRIMIDINE COMPOUND, AND PREPARATION METHOD AND APPLICATION THEREOF<br/>[FR] COMPOSÉ DE PYRIDINE À SUBSTITUTION CYANO ET COMPOSÉ DE PYRIMIDINE À SUBSTITUTION CYANO, PROCÉDÉ DE PRÉPARATION CORRESPONDANT ET UTILISATION ASSOCIÉE<br/>[ZH] 一种氰基取代吡啶及氰基取代嘧啶类化合物、制备方法及其应用