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From Ergolines to Indoles: Improved Inhibitors of the Human H3-Receptor for the Treatment of Narcolepsy

Auberson, Yves and Troxler, Thomas J. and Zhang, Xuechun and Yang, Charles and Feuerbach, Dominik and Liu, Yu-Chih and Lagu, Bharat and Perrone, Mark and Lei, Lijun and Shen, Xiaoxia and Zhang, Dushan and Wang, Chunxiu and Wang, Tie-Lin and Bock, Mark (2014) From Ergolines to Indoles: Improved Inhibitors of the Human H3-Receptor for the Treatment of Narcolepsy. ChemMedChem, 10 (2). pp. 266-275. ISSN 18607179

Abstract

Ergolines were recently identified as a novel class of H3-Receptor (H3R) inverse agonist. While 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 (R)-1-isopropyl-5-(1-(2-(2-methylpyrrolidin-1-yl)ethyl)-1H-indol-4-yl)pyridin-2(1H)-one) (15m), which has an ideal profile showing a strong correlation of PD effects with RO, and no measurable safety liabilities. Its desirable duration of action was confirmed by electroencephalography (EEG) measurements in rats.

Item Type: Article
Date Deposited: 26 Apr 2016 23:45
Last Modified: 26 Apr 2016 23:45
URI: https://oak.novartis.com/id/eprint/22787

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