RESUMEN
The discovery of 5,5'- and 6,6'-dialkyl-5,6-dihydro-1H-pyridin-2-ones as potent inhibitors of the HCV RNA-dependent RNA polymerase (NS5B) is described. Several of these agents also display potent antiviral activity in cell culture experiments (EC50 <0.10 microM). In vitro DMPK data for selected compounds as well as crystal structures of representative inhibitors complexed with the NS5B protein are also disclosed.
Asunto(s)
Antivirales/química , Inhibidores Enzimáticos/química , Hepacivirus/enzimología , Piridonas/química , ARN Polimerasa Dependiente del ARN/antagonistas & inhibidores , Proteínas no Estructurales Virales/metabolismo , Animales , Antivirales/síntesis química , Antivirales/farmacología , Sitios de Unión , Cristalografía por Rayos X , Inhibidores Enzimáticos/síntesis química , Inhibidores Enzimáticos/farmacología , Humanos , Macaca fascicularis , Microsomas Hepáticos/metabolismo , Piridonas/síntesis química , Piridonas/farmacología , ARN Polimerasa Dependiente del ARN/metabolismo , Relación Estructura-ActividadRESUMEN
5,6-Dihydro-1H-pyridin-2-one analogs were discovered as a novel class of inhibitors of genotype 1 HCV NS5B polymerase. Among these, compound 4ad displayed potent inhibitory activities in biochemical and replicon assays (IC(50) (1b)<10nM; IC(50) (1a)<25nM, EC(50) (1b)=16nM), good in vitro DMPK properties, as well as moderate oral bioavailability in monkeys (F=24%).
Asunto(s)
ARN Polimerasas Dirigidas por ADN/antagonistas & inhibidores , Inhibidores Enzimáticos/farmacología , Piridonas/farmacología , Proteínas no Estructurales Virales/antagonistas & inhibidores , Administración Oral , Animales , Disponibilidad Biológica , Inhibidores Enzimáticos/administración & dosificación , Inhibidores Enzimáticos/química , Inhibidores Enzimáticos/farmacocinética , Haplorrinos , Piridonas/administración & dosificación , Piridonas/química , Piridonas/farmacocinética , Relación Estructura-ActividadRESUMEN
A novel series of non-nucleoside small molecules containing a tricyclic dihydropyridinone structural motif was identified as potent HCV NS5B polymerase inhibitors. Driven by structure-based design and building on our previous efforts in related series of molecules, we undertook extensive SAR studies, in which we identified a number of metabolically stable and very potent compounds in genotype 1a and 1b replicon assays. This work culminated in the discovery of several inhibitors, which combined potent in vitro antiviral activity against both 1a and 1b genotypes, metabolic stability, good oral bioavailability, and high C(12) (PO)/EC(50) ratios.
Asunto(s)
Disponibilidad Biológica , Diseño de Fármacos , Relación Estructura-Actividad , Antivirales/farmacocinética , Química Farmacéutica , Cristalografía por Rayos X , Evaluación Preclínica de Medicamentos , Genotipo , Hepacivirus/efectos de los fármacos , Hepatitis C , Estructura Molecular , ARN Polimerasa Dependiente del ARN , Proteínas no Estructurales Virales/antagonistas & inhibidoresRESUMEN
The synthesis of 4-(1',1'-dioxo-1',4'-dihydro-1'lambda(6)-benzo[1',2',4']thiadiazin-3'-yl)-5-hydroxy-2H-pyridazin-3-ones bearing 6-amino substituents as potent inhibitors of the HCV RNA-dependent RNA polymerase (NS5B) is described. Several of these agents also display potent antiviral activity in cell culture experiments (EC(50)<0.10 microM). In vitro DMPK data (microsome t(1/2), Caco-2 P(app)) for many of the compounds are also disclosed, and a crystal structure of a representative inhibitor complexed with the NS5B protein is discussed.
Asunto(s)
Antivirales/síntesis química , Química Farmacéutica/métodos , Óxidos S-Cíclicos/síntesis química , Piridazinas/química , Piridazinas/síntesis química , Tiadiazinas/síntesis química , Proteínas no Estructurales Virales/antagonistas & inhibidores , Proteínas no Estructurales Virales/química , Antivirales/farmacología , Células CACO-2 , Cristalografía por Rayos X/métodos , Óxidos S-Cíclicos/farmacología , ARN Polimerasas Dirigidas por ADN/química , Diseño de Fármacos , Genotipo , Humanos , Concentración 50 Inhibidora , Microsomas/metabolismo , Modelos Químicos , Conformación Molecular , Piridazinas/farmacología , Relación Estructura-Actividad , Tiadiazinas/farmacologíaRESUMEN
4-(1,1-Dioxo-1,4-dihydro-1lambda(6)-benzo[1,4]thiazin-3-yl)-5-hydroxy-2H-pyridazin-3-one analogs were discovered as a novel class of inhibitors of HCV NS5B polymerase. Structure-based design led to the identification of compound 3a that displayed potent inhibitory activities in biochemical and replicon assays (1b IC(50)<10 nM; 1b EC(50)=1.1 nM) as well as good stability toward human liver microsomes (HLM t(1/2)>60 min).