Picomolar inhibitors of HIV reverse transcriptase featuring bicyclic replacement of a cyanovinylphenyl group

J Am Chem Soc. 2013 Nov 6;135(44):16705-13. doi: 10.1021/ja408917n. Epub 2013 Oct 24.

Abstract

Members of the catechol diether class are highly potent non-nucleoside inhibitors of HIV-1 reverse transcriptase (NNRTIs). The most active compounds yield EC50 values below 0.5 nM in assays using human T-cells infected by wild-type HIV-1. However, these compounds such as rilpivirine, the most recently FDA-approved NNRTI, bear a cyanovinylphenyl (CVP) group. This is an uncommon substructure in drugs that gives reactivity concerns. In the present work, computer simulations were used to design bicyclic replacements for the CVP group. The predicted viability of a 2-cyanoindolizinyl alternative was confirmed experimentally and provided compounds with 0.4 nM activity against the wild-type virus. The compounds also performed well with EC50 values of 10 nM against the challenging HIV-1 variant that contains the Lys103Asn/Tyr181Cys double mutation in the RT enzyme. Indolyl and benzofuranyl analogues were also investigated; the most potent compounds in these cases have EC50 values toward wild-type HIV-1 near 10 nM and high-nanomolar activities toward the double-variant. The structural expectations from the modeling were much enhanced by obtaining an X-ray crystal structure at 2.88 Å resolution for the complex of the parent 2-cyanoindolizine 10b and HIV-1 RT. The aqueous solubilities of the most potent indolizine analogues were also measured to be ~40 μg/mL, which is similar to that for the approved drug efavirenz and ~1000-fold greater than for rilpivirine.

Publication types

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

MeSH terms

  • Anti-HIV Agents / chemical synthesis
  • Anti-HIV Agents / chemistry
  • Anti-HIV Agents / pharmacology*
  • Bridged Bicyclo Compounds / chemical synthesis
  • Bridged Bicyclo Compounds / chemistry
  • Bridged Bicyclo Compounds / pharmacology*
  • Crystallography, X-Ray
  • Dose-Response Relationship, Drug
  • HIV Reverse Transcriptase / antagonists & inhibitors*
  • HIV Reverse Transcriptase / metabolism
  • HIV-1 / drug effects*
  • Microbial Sensitivity Tests
  • Models, Molecular
  • Molecular Dynamics Simulation
  • Molecular Structure
  • Monte Carlo Method
  • Reverse Transcriptase Inhibitors / chemical synthesis
  • Reverse Transcriptase Inhibitors / chemistry
  • Reverse Transcriptase Inhibitors / pharmacology*
  • Structure-Activity Relationship

Substances

  • Anti-HIV Agents
  • Bridged Bicyclo Compounds
  • Reverse Transcriptase Inhibitors
  • HIV Reverse Transcriptase