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Bioorg Med Chem Lett. 2013 Jul 1;23(13):3857-63. doi: 10.1016/j.bmcl.2013.04.071. Epub 2013 May 8.

Structure-activity relationship studies and sleep-promoting activity of novel 1-chloro-5,6,7,8-tetrahydroimidazo[1,5-a]pyrazine derivatives as dual orexin receptor antagonists. Part 2.

Author information

1
Actelion Pharmaceuticals Ltd, Drug Discovery and Preclinical Research & Development, Gewerbestrasse 16, CH-4123 Allschwil, Switzerland.

Abstract

Replacement of the dimethoxyphenyl moiety in the core skeleton of almorexant by appropriately substituted imidazoles afforded novel 1-chloro-5,6,7,8-tetrahydroimidazo[1,5-a]pyrazine derivatives as potent dual orexin receptor antagonists. We describe in this Letter our efforts to further optimize the potency and brain penetration of these derivatives by fine-tuning of the pivotal phenethyl motif, and we comment on the sleep-promoting activity of selected compounds in a rat electroencephalographic (EEG) model.

PMID:
23719231
DOI:
10.1016/j.bmcl.2013.04.071
[Indexed for MEDLINE]

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