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Bioorganic & medicinal chemistry letters

Proline bis-amides as potent dual orexin receptor antagonists.


PMID 18207395

Abstract

A series of OX(2)R/OX(1)R dual orexin antagonists was prepared based on a proline bis-amide identified as a screening lead. Through a combination of classical and library synthesis, potency enhancing replacements for both amide portions were discovered. N-methylation of the benzimidazole moiety within the lead structure significantly reduced P-gp susceptibility while increasing potency, giving rise to good brain penetration. A compound from this series has demonstrated in vivo central activity when dosed peripherally in a pharmacodynamic model of orexin activity.

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