3-Azatetracyclo[,8).0(1,5)]undecane derivatives: from wild-type inhibitors of the M2 ion channel of influenza A virus to derivatives with potent activity against the V27A mutant

J Med Chem. 2013 Nov 27;56(22):9265-74. doi: 10.1021/jm401340p. Epub 2013 Nov 15.


We have synthesized and characterized a series of compounds containing the 3-azatetracyclo[,8).0(1,5)]undecane scaffold designed as analogues of amantadine, an inhibitor of the M2 proton channel of influenza A virus. Inhibition of the wild-type (WT) M2 channel and the amantadine-resistant A/M2-S31N and A/M2-V27A mutant ion channels were measured in Xenopus oocytes using two-electrode voltage clamp (TEV) assays. Most of the novel compounds inhibited the WT ion channel in the low micromolar range. Of note, several compounds inhibited the A/M2 V27A mutant ion channel, one of them with submicromolar IC50. None of the compounds was found to inhibit the S31N mutant ion channel. The antiviral activity of three novel dual WT and A/M2-V27A channels inhibitors was confirmed by influenza virus yield assays.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amantadine / pharmacology
  • Animals
  • Antiviral Agents / chemistry
  • Antiviral Agents / pharmacology
  • Antiviral Agents / toxicity
  • Aza Compounds / chemistry*
  • Aza Compounds / pharmacology*
  • Aza Compounds / toxicity
  • Bridged-Ring Compounds / chemistry*
  • Bridged-Ring Compounds / pharmacology*
  • Bridged-Ring Compounds / toxicity
  • Dogs
  • Drug Design
  • Drug Resistance, Viral / drug effects
  • Guanidines / chemistry*
  • Guanidines / pharmacology*
  • Guanidines / toxicity
  • Influenza A Virus, H1N1 Subtype / drug effects*
  • Influenza A Virus, H1N1 Subtype / genetics
  • Influenza A Virus, H3N2 Subtype / drug effects*
  • Influenza A Virus, H3N2 Subtype / genetics
  • Inhibitory Concentration 50
  • Madin Darby Canine Kidney Cells
  • Mutation*
  • Pyrrolidines / chemistry
  • Structure-Activity Relationship
  • Viral Matrix Proteins / antagonists & inhibitors*
  • Viral Matrix Proteins / genetics


  • Antiviral Agents
  • Aza Compounds
  • Bridged-Ring Compounds
  • Guanidines
  • M2 protein, Influenza A virus
  • Pyrrolidines
  • Viral Matrix Proteins
  • Amantadine
  • pyrrolidine