<i>trans</i>-2-Aryl-<i>N</i>,<i>N</i>-dipropylcyclopropylamines: Synthesis and Interactions with 5-HT<sub>1A</sub> Receptors
作者:Jerk Vallgårda、Ulf Appelberg、Lars-Erik Arvidsson、Stephan Hjorth、Björn E. Svensson、Uli Hacksell
DOI:10.1021/jm9507136
日期:1996.1.1
Twelve N,N-dipropyl-substituted derivatives of trans-2-arylcyclopropylamine have been prepared and assayed for their ability to displace [H-3]-8-OH-DPAT from rat brain 5-HT1A receptors. The new derivatives include phenyl (7a), bromo- (7b) and fluorophenyl (7c-e), 2-methoxy-5-fluorophenyl (7h), and 2-hydroxy-5-fluorophenyl (7I) as well as trifluoromethylphenyl (7f) and 2,3-dichlorophenyl (7g) analogues. In the present series of compounds, electron-withdrawing substituents in the phenyl ring appear to decrease the affinity for 5-HT1A receptors. In contrast, electron-rich aryl groups, such as 2- or 3-thienyl (7j and 7k, respectively), provide compounds with high affinity. The additional bulk produced by the aromatic moiety in the 2-benzothienyl derivative 7i appears to be detrimental to 5-HT1A receptor affinity. The racemic mixtures of the interesting 7j and 7I were resolved into the enantiomers; 7j and 7I exhibited a high enantiomeric 5-HT1A receptor affinity ratio (75-fold and 100-fold, respectively). The enantiomers of 7j and 7I were evaluated in vivo by use of biochemical and behavioral tests in rats. Compound (LR,2R)-7j behaved as a partial agonist whereas (1R,2S)-7I appeared as an efficacious 5-HT1A receptor agonist, stimulating both autoreceptors and postsynaptic receptors.