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Bioorg Med Chem Lett. 2010 Dec 15;20(24):7259-64. doi: 10.1016/j.bmcl.2010.10.095. Epub 2010 Oct 25.

Discovery of NBI-77860/GSK561679, a potent corticotropin-releasing factor (CRF1) receptor antagonist with improved pharmacokinetic properties.

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Department of Medicinal Chemistry, Neurocrine Biosciences, San Diego, CA 92130, USA.


Antagonists of the corticotropin-releasing factor (CRF) neuropeptide may prove effective in treating stress and anxiety related disorders. In an effort to identify antagonists with improved physico-chemical properties a new series of CRF(1) antagonists were designed to substitute the propyl groups at the C7 position of the pyrazolo[1,5-a]pyrimidine core of 1 with heterocycles. Compound (S)-8d was identified as a high affinity ligand with a pK(i) value of 8.2 and a functional CRF(1) antagonist with pIC(50) value of 7.0 in the in vitro CRF ACTH production assay.

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