Discovery of 4-chloro-2-(2,4-dichloro-6-methylphenoxy)-1-methyl-7-(pentan-3-yl)-1H-benzimidazole, a novel CRF1 receptor antagonist
摘要:
Compound 1 exhibits potent binding inhibition activity against a corticotropin-releasing factor 1 (CRF1) receptor (IC50 = 9.5 nM) and in vitro antagonistic activity (IC50 = 88 nM) but is rapidly metabolized by human hepatic microsomes (182 mu L/min/mg). Here we identified metabolically stable compounds with potent CRF binding inhibitory activity. Structure-activity relationship (SAR) studies considering win vitro metabolic stability revealed that 4-chloro-2-(2,4-dichloro-6-methylphenoxy)-1-methyl-7-(pentan-3-yl)-1H-benzimidazole 24d was more stable in human microsomes (87 mu L/min/mg) than compound 1. Compound 24d demonstrated potent CRF1 binding inhibitory activity (IC50 = 4.1 nM), in vitro antagonistic activity (IC50 = 44 nM), and slow dissociation from the CREI receptor. Orally administered compound 24d (6-24 mu mol/kg) showed ex vivo CRF1 receptor binding in the rat pituitary, olfactory bulb, and frontal cortex and suppressed stress-induced adrenocorticotropic hormone (ACTH) secretion. In this report, we discuss SAR studies on the metabolic stability as well as CRF binding inhibitory activity of the benzimidazole series as CRF1 receptor antagonists and the pharmacological profiles of compound 24d. (C) 2016 Elsevier Ltd. All rights reserved.
Discovery of 4-chloro-2-(2,4-dichloro-6-methylphenoxy)-1-methyl-7-(pentan-3-yl)-1H-benzimidazole, a novel CRF1 receptor antagonist
摘要:
Compound 1 exhibits potent binding inhibition activity against a corticotropin-releasing factor 1 (CRF1) receptor (IC50 = 9.5 nM) and in vitro antagonistic activity (IC50 = 88 nM) but is rapidly metabolized by human hepatic microsomes (182 mu L/min/mg). Here we identified metabolically stable compounds with potent CRF binding inhibitory activity. Structure-activity relationship (SAR) studies considering win vitro metabolic stability revealed that 4-chloro-2-(2,4-dichloro-6-methylphenoxy)-1-methyl-7-(pentan-3-yl)-1H-benzimidazole 24d was more stable in human microsomes (87 mu L/min/mg) than compound 1. Compound 24d demonstrated potent CRF1 binding inhibitory activity (IC50 = 4.1 nM), in vitro antagonistic activity (IC50 = 44 nM), and slow dissociation from the CREI receptor. Orally administered compound 24d (6-24 mu mol/kg) showed ex vivo CRF1 receptor binding in the rat pituitary, olfactory bulb, and frontal cortex and suppressed stress-induced adrenocorticotropic hormone (ACTH) secretion. In this report, we discuss SAR studies on the metabolic stability as well as CRF binding inhibitory activity of the benzimidazole series as CRF1 receptor antagonists and the pharmacological profiles of compound 24d. (C) 2016 Elsevier Ltd. All rights reserved.
Compound 1 exhibits potent binding inhibition activity against a corticotropin-releasing factor 1 (CRF1) receptor (IC50 = 9.5 nM) and in vitro antagonistic activity (IC50 = 88 nM) but is rapidly metabolized by human hepatic microsomes (182 mu L/min/mg). Here we identified metabolically stable compounds with potent CRF binding inhibitory activity. Structure-activity relationship (SAR) studies considering win vitro metabolic stability revealed that 4-chloro-2-(2,4-dichloro-6-methylphenoxy)-1-methyl-7-(pentan-3-yl)-1H-benzimidazole 24d was more stable in human microsomes (87 mu L/min/mg) than compound 1. Compound 24d demonstrated potent CRF1 binding inhibitory activity (IC50 = 4.1 nM), in vitro antagonistic activity (IC50 = 44 nM), and slow dissociation from the CREI receptor. Orally administered compound 24d (6-24 mu mol/kg) showed ex vivo CRF1 receptor binding in the rat pituitary, olfactory bulb, and frontal cortex and suppressed stress-induced adrenocorticotropic hormone (ACTH) secretion. In this report, we discuss SAR studies on the metabolic stability as well as CRF binding inhibitory activity of the benzimidazole series as CRF1 receptor antagonists and the pharmacological profiles of compound 24d. (C) 2016 Elsevier Ltd. All rights reserved.