Synthesis and monoamine transporter binding properties of 2,3-diaryltropanes

J Med Chem. 2005 Nov 17;48(23):7437-44. doi: 10.1021/jm0582423.

Abstract

Synthetic procedures were developed for the synthesis of 2beta,3beta- and 2alpha,3alpha-diaryltropanes. These compounds are analogues of the 3-aryltropane-2beta-carboxylic acid methyl ester class of monoamine uptake inhibitors, where the 2beta-carbomethoxy group has been replaced by an aryl group. The compounds were evaluated for inhibition of radioligand binding at the dopamine, norepinephrine, and serotonin transporters (DAT, NET, and 5-HTT, respectively). The results showed that the replacement of the 2beta-carbomethoxy group in the 3-aryltropane class with a 2beta-aryl group led to compounds possessing very similar monoamine transporter binding properties. However, the 2beta,3beta-diaryltropanes tended to be more potent at the DAT and more selective for the DAT relative to the NET and 5-HTT. One of the most interesting compounds was 3beta-(4-methylphenyl)-2beta-(4-methylphenyl)tropane (3d), which showed an IC50 of 1.23 nM at the DAT with 289- and 185-fold selectivity for the DAT relative to the NET and 5-HTT. The 2alpha,3alpha-diaryltropanes were much less potent at all three transporters than 2beta,3beta-diaryltropanes.

Publication types

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

MeSH terms

  • Animals
  • Binding, Competitive
  • Dopamine Plasma Membrane Transport Proteins / metabolism*
  • Norepinephrine Plasma Membrane Transport Proteins / metabolism*
  • Radioligand Assay
  • Rats
  • Serotonin Plasma Membrane Transport Proteins / metabolism*
  • Stereoisomerism
  • Structure-Activity Relationship
  • Tropanes / chemical synthesis*
  • Tropanes / chemistry
  • Tropanes / metabolism

Substances

  • 3-(4-methylphenyl)-2-(4-methylphenyl)tropane
  • Dopamine Plasma Membrane Transport Proteins
  • Norepinephrine Plasma Membrane Transport Proteins
  • Serotonin Plasma Membrane Transport Proteins
  • Tropanes