Synthesis and anti-HIV activity of new alkenyldiarylmethane (ADAM) non-nucleoside reverse transcriptase inhibitors (NNRTIs) incorporating benzoxazolone and benzisoxazole rings

Bioorg Med Chem. 2006 Apr 1;14(7):2366-74. doi: 10.1016/j.bmc.2005.11.014.


The HIV-1 non-nucleoside reverse transcriptase inhibitors (NNRTIs) constitute a large and structurally diverse set of compounds, several of which are currently used in the treatment of AIDS. A series of novel alkenyldiarylmethanes (ADAMs) were designed and synthesized as part of an ongoing investigation to replace the metabolically labile methyl ester moieties found in the ADAM pharmacophore with stable modifications that retain the potent anti-HIV activity of the parent compounds. Unsurprisingly, the rat plasma half-lives of the new ADAMs were not improved when compared to the parent compounds, but all of the synthesized ADAMs inhibited the cytopathic effect of HIV-1 in cell culture. The most potent compound identified was (E)-5-[1-(3,7-dimethyl-2-oxo-2,3-dihydro-benzoxazol-5-yl)-5-methoxycarbonyl-pent-1-enyl]-2-methoxy-3-methylbenzoic acid methyl ester (7), which inhibited the cytopathic effects of both HIV-1(RF) and HIV-1(IIIB) strains in cell cultures with EC50 values of 30 and 90 nM, respectively, and inhibited HIV-1 reverse transcriptase with an IC50 of 20 nM.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Anti-HIV Agents / chemical synthesis*
  • Anti-HIV Agents / chemistry
  • Anti-HIV Agents / pharmacology*
  • Benzoxazoles / chemistry
  • Cell Line
  • Crystallography, X-Ray
  • Drug Design
  • HIV-1 / drug effects
  • HIV-2 / drug effects
  • Humans
  • In Vitro Techniques
  • Isoxazoles / chemistry
  • Methane / analogs & derivatives
  • Methane / chemical synthesis*
  • Methane / pharmacology*
  • Microbial Sensitivity Tests
  • Models, Molecular
  • Molecular Structure
  • Protein Conformation
  • Rats
  • Reverse Transcriptase Inhibitors / chemical synthesis*
  • Reverse Transcriptase Inhibitors / chemistry
  • Reverse Transcriptase Inhibitors / pharmacology*
  • Structure-Activity Relationship


  • 1,2-benzisoxazole
  • Anti-HIV Agents
  • Benzoxazoles
  • Isoxazoles
  • Reverse Transcriptase Inhibitors
  • benzoxazolone
  • Methane