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Bioorg Med Chem Lett. 2010 Apr 1;20(7):2316-20. doi: 10.1016/j.bmcl.2010.01.134. Epub 2010 Feb 2.

Novel benzothiophene H1-antihistamines for the treatment of insomnia.

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Neurocrine Biosciences, 12780 El Camino Real, San Diego, CA 92130, USA.


SAR of lead benzothiophene H(1)-antihistamine 2 was explored to identify backup candidates with suitable pharmacokinetic profiles for an insomnia program. Several potent and selective H(1)-antihistamines with a range of projected half-lives in humans were identified. Compound 16d had a suitable human half-life as demonstrated in a human microdose study, but variability in pharmacokinetic profile, attributed to metabolic clearance, prevented further development of this compound. Compound 28b demonstrated lower predicted clearance in preclinical studies, and may represent a more suitable backup compound.

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