New benzocycloalkylpiperazines, potent and selective 5-HT1A receptor ligands

J Med Chem. 1997 Mar 14;40(6):952-60. doi: 10.1021/jm950759z.


A series of 1-(benzocycloalkyl)-4-(benzamidolkyl)piperazine derivatives was prepared in order to obtain compounds with a high affinity and selectivity for 5-HT1A receptors. The modifications of aromatic substituents, the length of the alkyl chain, and the size of the ring were explored. Most of N-(1,2,3,4-tetrahydronaphthyl)-N'-(benzamidoethyl)piperazines (32-37) were bound to 5-HT1A receptors in a nanomolar range and presented a high degree of selectivity. After resolution, levorotatory enantiomers showed affinity and selectivity higher than those of dextrorotory ones for 5-HT1A sites. The agonist type activity of selected derivatives was also confirmed in vitro on the inhibition of the activation of adenylate cyclase induced by forskolin and, in vivo, on the induction of the lower lip retraction in rats.

MeSH terms

  • Adenylyl Cyclases / metabolism
  • Animals
  • Behavior, Animal / drug effects
  • Binding, Competitive
  • Colforsin / pharmacology
  • Cyclic AMP / metabolism
  • Electrophysiology
  • Enzyme Activation
  • Kinetics
  • Magnetic Resonance Spectroscopy
  • Molecular Conformation
  • Molecular Structure
  • Piperazines / chemical synthesis
  • Piperazines / chemistry
  • Piperazines / pharmacology*
  • Protein Binding
  • Rats
  • Rats, Wistar
  • Receptors, Adrenergic / metabolism
  • Receptors, Dopamine / metabolism
  • Receptors, Serotonin / metabolism*
  • Receptors, Serotonin, 5-HT1
  • Serotonin Receptor Agonists / chemical synthesis
  • Serotonin Receptor Agonists / chemistry
  • Serotonin Receptor Agonists / pharmacology*
  • Stereoisomerism
  • Structure-Activity Relationship


  • Piperazines
  • Receptors, Adrenergic
  • Receptors, Dopamine
  • Receptors, Serotonin
  • Receptors, Serotonin, 5-HT1
  • Serotonin Receptor Agonists
  • Colforsin
  • Cyclic AMP
  • Adenylyl Cyclases