Journal
JOURNAL OF MEDICINAL CHEMISTRY
Volume 50, Issue 23, Pages 5564-5567Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jm070668p
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Calcitonin gene-related peptide (CGRP) has been implicated in the pathogenesis of migraine. Herein we describe optimization of CGRP receptor antagonists based on an earlier lead structure containing a (3R)-amino-(6S)-phenylcaprolactam core. Replacement of the phenylimidazolinone with an azabenzimidazolone gave stable derivatives with lowered serum shifts. Extensive SAR studies of the C-6 aryl moiety revealed the potency-enhancing effect of the 2,3-difluorophenyl group, and trifluoroethylation of the N-1 amide position resulted in improved oral bioavailabilities, ultimately leading to clinical candidate 38 (MK-0974).
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