Chemistry and pharmacological characterization of novel nitrogen analogues of AMOP-H-OH (Sazetidine-A, 6-[5-(azetidin-2-ylmethoxy)pyridin-3-yl]hex-5-yn-1-ol) as α4β2-nicotinic acetylcholine receptor-selective partial agonists

J Med Chem. 2010 Oct 14;53(19):6973-85. doi: 10.1021/jm100765u.

Abstract

In order to advance therapeutic applications of nicotinic ligands, continuing research efforts are being directed toward the identification and characterization of novel nicotinic acetylcholine receptor (nAChR) ligands that are both potent and subtype selective. Herein we report the synthesis and pharmacological evaluation of members of a new series of 3-alkoxy-5-aminopyridine derivatives that display good selectivity for the α4β2-nAChR subtype based on ligand binding and functional evaluations. The most potent ligand in this series, compound 64, showed high radioligand binding affinity and selectivity for rat α4β2-nAChR with a K(i) value of 1.2 nM and 4700-fold selectivity for α4β2- over α3β4-nAChR, and ∼100-fold selectivity for functional, high-sensitivity, human α4β2-nAChR over α3β4*-nAChR. In the mouse forced swim test, compound 64 exhibited antidepressant-like effects. Structure-activity relationship (SAR) analyses suggest that the introduction of additional substituents to the amino group present on the pyridine ring of the N-demethylated analogue of compound 17 can provide potent α4β2-nAChR-selective ligands for possible use in treatment of neurological and psychiatric disorders including depression.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aminopyridines / chemical synthesis*
  • Aminopyridines / chemistry
  • Aminopyridines / pharmacology
  • Animals
  • Antidepressive Agents / chemical synthesis*
  • Antidepressive Agents / chemistry
  • Antidepressive Agents / pharmacology
  • Azetidines / chemical synthesis*
  • Azetidines / chemistry
  • Azetidines / pharmacology
  • Binding, Competitive
  • Cell Line
  • Chlorocebus aethiops
  • Cricetinae
  • Cricetulus
  • Drug Partial Agonism
  • Humans
  • In Vitro Techniques
  • Ligands
  • Male
  • Mice
  • Mice, Inbred BALB C
  • Prosencephalon / metabolism
  • Pyridines / chemical synthesis*
  • Pyridines / chemistry
  • Pyridines / pharmacology
  • Pyrrolidines / chemical synthesis*
  • Pyrrolidines / chemistry
  • Pyrrolidines / pharmacology
  • Radioligand Assay
  • Rats
  • Receptors, Nicotinic / physiology*
  • Stereoisomerism
  • Structure-Activity Relationship

Substances

  • 3-((2-pyrrolidinyl)methoxy)-5-phenylaminopyridine
  • Aminopyridines
  • Antidepressive Agents
  • Azetidines
  • Ligands
  • Pyridines
  • Pyrrolidines
  • Receptors, Nicotinic
  • nicotinic receptor alpha4beta2
  • sazetidine-A