Synthesis and in vivo evaluation of [11C]MPTQ: a potential PET tracer for alpha2A-adrenergic receptors

Bioorg Med Chem Lett. 2010 Jun 15;20(12):3654-7. doi: 10.1016/j.bmcl.2010.04.099. Epub 2010 May 22.

Abstract

Radiosynthesis and in vivo evaluation of [N-methyl-(11)C] 5-methyl-3-[4-(3-phenylallyl)-piperazin-1-ylmethyl]-3,3a,4,5-tetrahydroisoxazolo[4,3-c]quinoline (1), a potential PET tracer for alpha2-adrenergic receptors is described. Syntheses of nonradioactive standard 1 and corresponding desmethyl precursor 2 were achieved from 2-aminobenzaldehyde in 40% and 65% yields, respectively. Methylation using [(11)C]CH(3)I in presence of aqueous potassium hydroxide in DMSO afforded [(11)C]1 in 25% yield (EOS) with >99% chemical and radiochemical purities with a specific activity ranged from 3-4 Ci/micromol (n=6). The total synthesis time was 30 min from EOB. PET studies in anesthetized baboon show that [(11)C]1 penetrates BBB and accumulates in alpha2A-AR enriched brain areas.

MeSH terms

  • Animals
  • Benzaldehydes / chemistry
  • Blood-Brain Barrier / metabolism
  • Brain / metabolism
  • Carbon Radioisotopes
  • Isotope Labeling
  • Isoxazoles* / chemical synthesis
  • Methylation
  • Papio
  • Quinolines* / chemical synthesis
  • Quinolines* / pharmacokinetics
  • Radiopharmaceuticals / chemical synthesis*
  • Radiopharmaceuticals / pharmacokinetics
  • Receptors, Adrenergic, alpha-2 / analysis*
  • Tissue Distribution

Substances

  • (N-methyl-(11)C) 5-methyl-3-(4-(3-phenylallyl)-piperazin-1-ylmethyl)-3,3a,4,5-tetrahydroisoxazolo(4,3-c)quinoline
  • Benzaldehydes
  • Carbon Radioisotopes
  • Isoxazoles
  • Quinolines
  • Radiopharmaceuticals
  • Receptors, Adrenergic, alpha-2
  • 2-aminobenzaldehyde