Synthesis, evaluation, and comparative molecular field analysis of 1-phenyl-3-amino-1,2,3,4-tetrahydronaphthalenes as ligands for histamine H(1) receptors

J Med Chem. 1999 Aug 12;42(16):3041-54. doi: 10.1021/jm980428x.


A series of 1-phenyl-3-amino-1,2,3,4-tetrahydronaphthalenes (1-phenyl-3-aminotetralins, PATs) previously was found to modulate tyrosine hydroxylase activity and dopamine synthesis in rodent forebrain through interaction with a binding site labeled by [(3)H]-(-)-(1R,3S)-trans-H(2)-PAT. Recently, we have discovered that PATs also bind with high affinity to the [(3)H]mepyramine-labeled H(1) receptor in rat and guinea pig brain. Here, we report the synthesis and biological evaluation of additional PAT analogues in order to identify differences in binding at these two sites. Further molecular modifications involve the pendant phenyl ring as well as quaternary amine compounds. Comparison of about 38 PAT analogues, 10 structurally diverse H(1) ligands, and several other CNS-active compounds revealed no significant differences in affinity at [(3)H]-(-)-trans-H(2)-PAT sites versus [(3)H]mepyramine-labeled H(1) receptors. These results, together with previous autoradiographic brain receptor-mapping studies that indicate similar distribution of [(3)H]-(-)-trans-H(2)-PAT sites and [(3)H]mepyramine-labeled H(1) receptors, suggest that both radioligands label the same histamine H(1) receptors in rodent brain. We also report a revision of our previous comparative molecular field analysis (CoMFA) study of the PAT ligands that yields a highly predictive model for 66 compounds with a cross-validated R(2) (q(2)) value of 0.67. This model will be useful for the prediction of high-affinity ligands at radiolabeled H(1) receptors in mammalian brain.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Binding Sites
  • Binding, Competitive
  • Brain / metabolism
  • Guinea Pigs
  • Histamine H1 Antagonists / chemical synthesis*
  • Histamine H1 Antagonists / chemistry
  • Histamine H1 Antagonists / metabolism
  • In Vitro Techniques
  • Ligands
  • Models, Molecular
  • Pyrilamine / metabolism
  • Radioligand Assay
  • Structure-Activity Relationship
  • Tetrahydronaphthalenes / chemical synthesis*
  • Tetrahydronaphthalenes / chemistry
  • Tetrahydronaphthalenes / metabolism


  • Histamine H1 Antagonists
  • Ligands
  • Tetrahydronaphthalenes
  • 1-phenyl-3-dimethylamino-1,2,3,4-tetrahydronaphthalene
  • Pyrilamine