RESUMO
The potent 5-lipoxygenase-activating protein (FLAP) inhibitor 3-[3-tert-butylsulfanyl-1-[4-(6-ethoxypyridin-3-yl)benzyl]-5-(5-methylpyridin-2-ylmethoxy)-1H-indol-2-yl]-2,2-dimethylpropionic acid 11cc is described (AM803, now GSK2190915). Building upon AM103 (1) (Hutchinson et al. J. Med Chem.2009, 52, 5803-5815; Stock et al. Bioorg. Med. Chem. Lett. 2010, 20, 213-217; Stock et al. Bioorg. Med. Chem. Lett.2010, 20, 4598-4601), SAR studies centering around the pyridine moiety led to the discovery of compounds that exhibit significantly increased potency in a human whole blood assay measuring LTB(4) inhibition with longer drug preincubation times (15 min vs 5 h). Further studies identified 11cc with a potency of 2.9 nM in FLAP binding, an IC(50) of 76 nM for inhibition of LTB(4) in human blood (5 h incubation) and excellent preclinical toxicology and pharmacokinetics in rat and dog. 11cc also demonstrated an extended pharmacodynamic effect in a rodent bronchoalveolar lavage (BAL) model. This compound has successfully completed phase 1 clinical studies in healthy volunteers and is currently undergoing phase 2 trials in asthmatic patients.
Assuntos
Inibidores da Proteína Ativadora de 5-Lipoxigenase/síntese química , Antiasmáticos/síntese química , Indóis/síntese química , Ácidos Pentanoicos/síntese química , Inibidores da Proteína Ativadora de 5-Lipoxigenase/farmacocinética , Inibidores da Proteína Ativadora de 5-Lipoxigenase/farmacologia , Administração Oral , Animais , Antiasmáticos/farmacocinética , Antiasmáticos/farmacologia , Lavagem Broncoalveolar , Inibidores das Enzimas do Citocromo P-450 , Cães , Feminino , Humanos , Técnicas In Vitro , Indóis/farmacocinética , Indóis/farmacologia , Masculino , Ácidos Pentanoicos/farmacocinética , Ácidos Pentanoicos/farmacologia , Ratos , Ratos Sprague-Dawley , Relação Estrutura-AtividadeRESUMO
The potent and selective 5-lipoxygenase-activating protein leukotriene synthesis inhibitor 3-[3-tert-butylsulfanyl-1-[4-(6-methoxy-pyridin-3-yl)-benzyl]-5-(pyridin-2-ylmethoxy)-1H-indol-2-yl]-2,2-dimethyl-propionic acid (11j) is described. Lead optimization was designed to afford compounds with superior in vitro and in vivo inhibition of leukotriene synthesis in addition to having excellent pharmacokinetics and safety in rats and dogs. The key structural features of these new compounds are incorporation of heterocycles on the indole N-benzyl substituent and replacement of the quinoline group resulting in compounds with excellent in vitro and in vivo activities, superior pharmacokinetics, and improved physical properties. The methoxypyridine derivative 11j has an IC(50) of 4.2 nM in a 5-lipoxygenase-activating protein (FLAP) binding assay, an IC(50) of 349 nM in the human blood LTB(4) inhibition assay, and is efficacious in a murine ovalbumin model of allergen-induced asthma. Compound 11j was selected for clinical development and has successfully completed phase 1 trials in healthy volunteers.
Assuntos
Proteínas de Transporte/antagonistas & inibidores , Indóis/farmacocinética , Leucotrieno B4/antagonistas & inibidores , Proteínas de Membrana/antagonistas & inibidores , Propionatos/farmacocinética , Proteínas Ativadoras de 5-Lipoxigenase , Animais , Asma/tratamento farmacológico , Cães , Efeitos Colaterais e Reações Adversas Relacionados a Medicamentos , Compostos Heterocíclicos/química , Humanos , Concentração Inibidora 50 , Leucotrieno B4/biossíntese , Camundongos , Ligação Proteica , Ratos , Relação Estrutura-AtividadeRESUMO
A water soluble choline prodrug (17) of a COX-2 selective inhibitor (16) suitable for intravenous dosing in models of cerebral ischemia has been developed. Constant infusion studies using 17 demonstrate that extrapolated brain levels of 16 may be maintained for over 24h in rats.