Discovery of Clinical Candidate 1-{[(2S,3S,4S)-3-Ethyl-4-fluoro-5-oxopyrrolidin-2-yl]methoxy}-7-methoxyisoquinoline-6-carboxamide (PF-06650833), a Potent, Selective Inhibitor of Interleukin-1 Receptor Associated Kinase 4 (IRAK4), by Fragment-Based Drug Design

J Med Chem. 2017 Jul 13;60(13):5521-5542. doi: 10.1021/acs.jmedchem.7b00231. Epub 2017 Jun 14.

Abstract

Through fragment-based drug design focused on engaging the active site of IRAK4 and leveraging three-dimensional topology in a ligand-efficient manner, a micromolar hit identified from a screen of a Pfizer fragment library was optimized to afford IRAK4 inhibitors with nanomolar potency in cellular assays. The medicinal chemistry effort featured the judicious placement of lipophilicity, informed by co-crystal structures with IRAK4 and optimization of ADME properties to deliver clinical candidate PF-06650833 (compound 40). This compound displays a 5-unit increase in lipophilic efficiency from the fragment hit, excellent kinase selectivity, and pharmacokinetic properties suitable for oral administration.

MeSH terms

  • Administration, Oral
  • Dose-Response Relationship, Drug
  • Drug Discovery*
  • Humans
  • Interleukin-1 Receptor-Associated Kinases / antagonists & inhibitors*
  • Interleukin-1 Receptor-Associated Kinases / metabolism
  • Isoquinolines / administration & dosage
  • Isoquinolines / chemistry
  • Isoquinolines / pharmacology*
  • Models, Molecular
  • Molecular Structure
  • Protein Kinase Inhibitors / administration & dosage
  • Protein Kinase Inhibitors / chemistry
  • Protein Kinase Inhibitors / pharmacology*
  • Structure-Activity Relationship

Substances

  • 1-(((2S,3S,4S)-3-ethyl-4-fluoro-5-oxopyrrolidin-2-yl)methoxy)-7-methoxyisoquinoline-6-carboxamide
  • Isoquinolines
  • Protein Kinase Inhibitors
  • IRAK4 protein, human
  • Interleukin-1 Receptor-Associated Kinases