4-[3-(4-cyclopropanecarbonylpiperazine-1-carbonyl)-4-fluorobenzyl]-2H-phthalazin-1-one: A Novel Bioavailable Inhibitor of poly(ADP-ribose) polymerase-1

J Med Chem. 2008 Oct 23;51(20):6581-91. doi: 10.1021/jm8001263. Epub 2008 Sep 19.

Abstract

Poly(ADP-ribose) polymerase activation is an immediate cellular response to metabolic-, chemical-, or ionizing radiation-induced DNA damage and represents a new target for cancer therapy. In this article, we disclose a novel series of substituted 4-benzyl-2 H-phthalazin-1-ones that possess high inhibitory enzyme and cellular potency for both PARP-1 and PARP-2. Optimized compounds from the series also demonstrate good pharmacokinetic profiles, oral bioavailability, and activity in vivo in an SW620 colorectal cancer xenograft model. 4-[3-(4-Cyclopropanecarbonylpiperazine-1-carbonyl)-4-fluorobenzyl]-2 H-phthalazin-1-one (KU-0059436, AZD2281) 47 is a single digit nanomolar inhibitor of both PARP-1 and PARP-2 that shows standalone activity against BRCA1-deficient breast cancer cell lines. Compound 47 is currently undergoing clinical development for the treatment of BRCA1- and BRCA2-defective cancers.

MeSH terms

  • Animals
  • Antineoplastic Agents / chemical synthesis
  • Antineoplastic Agents / chemistry
  • Antineoplastic Agents / pharmacology
  • Cell Line
  • Cell Survival / drug effects
  • Dogs
  • Enzyme Inhibitors / chemical synthesis*
  • Enzyme Inhibitors / chemistry
  • Enzyme Inhibitors / pharmacology*
  • Humans
  • Mice
  • Molecular Structure
  • Phthalazines / chemical synthesis*
  • Phthalazines / chemistry
  • Phthalazines / pharmacology*
  • Piperazines / chemical synthesis*
  • Piperazines / chemistry
  • Piperazines / pharmacology*
  • Poly(ADP-ribose) Polymerase Inhibitors*
  • Poly(ADP-ribose) Polymerases / metabolism
  • Rats
  • Structure-Activity Relationship

Substances

  • 4-(3-(4-cyclopropanecarbonylpiperazine-1-carbonyl)-4-fluorobenzyl)-2H-phthalazin-1-one
  • Antineoplastic Agents
  • Enzyme Inhibitors
  • Phthalazines
  • Piperazines
  • Poly(ADP-ribose) Polymerase Inhibitors
  • Poly(ADP-ribose) Polymerases