4-(1,1-Dioxo-1,4-dihydro-1lambda6-benzo[1,4]thiazin-3-yl)-5-hydroxy-2H-pyridazin-3-ones as potent inhibitors of HCV NS5B polymerase

Bioorg Med Chem Lett. 2008 Aug 15;18(16):4628-32. doi: 10.1016/j.bmcl.2008.07.014. Epub 2008 Jul 10.

Abstract

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).

MeSH terms

  • Caco-2 Cells
  • Chemistry, Pharmaceutical / methods*
  • Crystallography, X-Ray / methods
  • Drug Design
  • Hepacivirus / drug effects
  • Hepacivirus / enzymology*
  • Humans
  • Inhibitory Concentration 50
  • Microsomes, Liver / enzymology*
  • Models, Chemical
  • Molecular Conformation
  • Pyridazines / chemical synthesis*
  • Pyridazines / chemistry
  • Pyridazines / pharmacology*
  • Structure-Activity Relationship
  • Thiazines / chemical synthesis*
  • Thiazines / chemistry
  • Thiazines / pharmacology
  • Time Factors
  • Viral Nonstructural Proteins / antagonists & inhibitors*
  • Viral Nonstructural Proteins / chemistry*

Substances

  • Pyridazines
  • Thiazines
  • Viral Nonstructural Proteins
  • NS-5 protein, hepatitis C virus