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From ergolines to indoles: improved inhibitors of the human H3 receptor for the treatment of narcolepsy.

Abstract
Ergolines were recently identified as a novel class of H3 receptor (H3R) inverse agonists. Although their optimization led to drug candidates with encouraging properties for the treatment of narcolepsy, brain penetration remained low. To overcome this issue, ergoline 1 ((6aR,9R,10aR)-4-(2-(dimethylamino)ethyl)-N-phenyl-9-(pyrrolidine-1-carbonyl)-6,6a,8,9,10,10a-hexahydroindolo[4,3-fg]quinoline-7(4H)-carboxamide)) was transformed into a series of indole derivatives with high H3R affinity. These new molecules were profiled by simultaneous determination of their brain receptor occupancy (RO) levels and pharmacodynamic (PD) effects in mice. These efforts culminated in the discovery of 15 m ((R)-1-isopropyl-5-(1-(2-(2-methylpyrrolidin-1-yl)ethyl)-1H-indol-4-yl)pyridin-2(1H)-one), which has an ideal profile showing a strong correlation of PD effects with RO, and no measurable safety liabilities. Its desirably short duration of action was confirmed by electroencephalography (EEG) measurements in rats.
AuthorsYves P Auberson, Thomas Troxler, Xuechun Zhang, Charles R Yang, Dominik Feuerbach, Yu-Chih Liu, Bharat Lagu, Mark Perrone, Lijun Lei, Xiaoxia Shen, Dushan Zhang, Chunxiu Wang, Tie-Lin Wang, Karin Briner, Mark G Bock
JournalChemMedChem (ChemMedChem) Vol. 10 Issue 2 Pg. 266-75 (Feb 2015) ISSN: 1860-7187 [Electronic] Germany
PMID25394333 (Publication Type: Journal Article)
Copyright© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Chemical References
  • 1-isopropyl-5-(1-(2-(2-methylpyrrolidin-1-yl)ethyl)-1H-indol-4-yl)pyridin-2(1H)-one
  • Ergolines
  • Histamine Antagonists
  • Indoles
  • Pyridones
  • Receptors, Histamine H3
Topics
  • Animals
  • Brain (metabolism)
  • CHO Cells
  • Cricetinae
  • Cricetulus
  • Electroencephalography
  • Ergolines (chemistry, pharmacokinetics, therapeutic use)
  • Half-Life
  • Histamine Antagonists (chemistry, pharmacokinetics, therapeutic use)
  • Humans
  • Indoles (chemistry, pharmacokinetics, therapeutic use)
  • Male
  • Mice
  • Narcolepsy (drug therapy, metabolism, pathology)
  • Protein Binding
  • Pyridones (chemistry, pharmacokinetics, therapeutic use)
  • Rats
  • Rats, Sprague-Dawley
  • Receptors, Histamine H3 (chemistry, metabolism)
  • Structure-Activity Relationship

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