Optimization of a Series of Bivalent Triazolopyridazine Based Bromodomain and Extraterminal Inhibitors: The Discovery of (3R)-4-[2-[4-[1-(3-Methoxy-[1,2,4]triazolo[4,3-b]pyridazin-6-yl)-4-piperidyl]phenoxy]ethyl]-1,3-dimethyl-piperazin-2-one (AZD5153)

J Med Chem. 2016 Sep 8;59(17):7801-17. doi: 10.1021/acs.jmedchem.6b00070. Epub 2016 Aug 24.

Abstract

Here we report the discovery and optimization of a series of bivalent bromodomain and extraterminal inhibitors. Starting with the observation of BRD4 activity of compounds from a previous program, the compounds were optimized for BRD4 potency and physical properties. The optimized compound from this campaign exhibited excellent pharmacokinetic profile and exhibited high potency in vitro and in vivo effecting c-Myc downregulation and tumor growth inhibition in xenograft studies. This compound was selected as the development candidate, AZD5153. The series showed enhanced potency as a result of bivalent binding and a clear correlation between BRD4 activity and cellular potency.

MeSH terms

  • Animals
  • Antineoplastic Agents / chemistry*
  • Antineoplastic Agents / pharmacokinetics
  • Antineoplastic Agents / pharmacology
  • Caco-2 Cells
  • Cell Cycle Proteins
  • Crystallography, X-Ray
  • Dogs
  • Female
  • Hepatocytes / drug effects
  • Hepatocytes / metabolism
  • Heterocyclic Compounds, 2-Ring / chemistry*
  • Heterocyclic Compounds, 2-Ring / pharmacokinetics
  • Heterocyclic Compounds, 2-Ring / pharmacology
  • Heterografts
  • Humans
  • Mice, SCID
  • Neoplasm Transplantation
  • Nuclear Proteins / antagonists & inhibitors*
  • Piperazines / chemistry*
  • Piperazines / pharmacokinetics
  • Piperazines / pharmacology
  • Protein Conformation
  • Rats
  • Stereoisomerism
  • Structure-Activity Relationship
  • Transcription Factors / antagonists & inhibitors*

Substances

  • Antineoplastic Agents
  • BRD4 protein, human
  • Cell Cycle Proteins
  • Heterocyclic Compounds, 2-Ring
  • Nuclear Proteins
  • Piperazines
  • Transcription Factors
  • AZD5153