The design, synthesis and biological evaluations of C-6 or C-7 substituted 2-hydroxyisoquinoline-1,3-diones as inhibitors of hepatitis C virus

Bioorg Med Chem. 2012 Jan 1;20(1):467-79. doi: 10.1016/j.bmc.2011.10.058. Epub 2011 Oct 24.


C7-Substituted 2-hydroxyisoquinoline-1,3-diones inhibit the strand transfer of HIV integrase (IN) and the reverse-transcriptase-associated ribonuclease H (RNH). Hepatitis C virus (HCV) NS5B polymerase shares a similar active site fold to RNH and IN, suggesting that N-hydroxyimides could be useful inhibitor scaffolds of HCV via targeting the NS5B. Herein we describe the design, chemical synthesis, replicon and biochemical assays, and molecular docking of C-6 or C-7 aryl substituted 2-hydroxyisoquinoline-1,3-diones as novel HCV inhibitors. The synthesis involved an improved and clean cyclization method, which allowed the convenient preparation of various analogs. Biological studies revealed that the C-6 analogs, a previously unknown chemotype, consistently inhibit both HCV replicon and recombinant NS5B at low micromolar range. Molecular modeling studies suggest that these inhibitors may bind to the NS5B active site.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antiviral Agents / chemical synthesis*
  • Antiviral Agents / chemistry
  • Antiviral Agents / pharmacology*
  • Binding Sites
  • Catalytic Domain
  • Computer Simulation
  • Cyclization
  • Drug Design
  • Enzyme Inhibitors / chemical synthesis
  • Enzyme Inhibitors / chemistry
  • Enzyme Inhibitors / pharmacology
  • Hepacivirus / drug effects*
  • Hepacivirus / enzymology
  • Isoquinolines / chemical synthesis
  • Isoquinolines / chemistry*
  • Isoquinolines / pharmacology
  • Structure-Activity Relationship
  • Viral Nonstructural Proteins / antagonists & inhibitors
  • Viral Nonstructural Proteins / metabolism
  • Virus Replication / drug effects


  • Antiviral Agents
  • Enzyme Inhibitors
  • Isoquinolines
  • Viral Nonstructural Proteins
  • NS-5 protein, hepatitis C virus