Structurally constrained hybrid derivatives containing octahydrobenzo[g or f]quinoline moieties for dopamine D2 and D3 receptors: binding characterization at D2/D3 receptors and elucidation of a pharmacophore model

J Med Chem. 2008 Dec 25;51(24):7806-19. doi: 10.1021/jm8008629.


A series of structurally constrained analogues based on hybrid compounds containing octahydrobenzo[g or f]quinoline moieties were designed, synthesized, and characterized for their binding to dopamine D2 and D3 receptors expressed in HEK-293 cells. Among the newly developed constrained molecules, trans-octahydrobenzo[f]quinolin-7-ol (8) exhibited the highest affinity for D2 and D3 receptors, the (-)-isomer being the eutomer. Interestingly, this hybrid constrained version 8 showed significant affinity over the corresponding nonhybrid version 1 (representing a constrained version of the aminotetralin structure only) when assayed under same conditions (K(i) of 49.1 and 14.9 nM for 8 vs 380 and 96.0 nM for 1 at D2 and D3, respectively). Similar results were found with other lead hybrid compounds, indicating a contribution of the piperazine moiety in the observed enhanced affinity. On the basis of the data of new lead constrained derivatives and other lead hybrid derivatives developed by us, a unique pharmacophore model was proposed consisting of three pharmacophoric centers, two with aromatic/hydrophobic and one with cationic features.

Publication types

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

MeSH terms

  • Biophysical Phenomena
  • Cations
  • Cell Line
  • Chemistry, Pharmaceutical / methods*
  • Dopamine / chemistry
  • Dopamine Antagonists / chemistry
  • Dopamine Antagonists / metabolism*
  • Drug Design
  • Humans
  • Kinetics
  • Models, Chemical
  • Protein Binding
  • Quinolines / chemistry*
  • Quinolizines / chemistry*
  • Receptors, Dopamine D2 / chemistry*
  • Receptors, Dopamine D3 / chemistry*


  • Cations
  • Dopamine Antagonists
  • Quinolines
  • Quinolizines
  • Receptors, Dopamine D2
  • Receptors, Dopamine D3
  • octahydrobenzo(c)quinolizin-3-one
  • quinoline
  • Dopamine