Discovery of Diaryl Imidazolidin-2-one Derivatives, a Novel Class of Muscarinic M3 Selective Antagonists (Part 1)
作者:Ilaria Peretto、Roberto Forlani、Claudia Fossati、Giuseppe A. M. Giardina、Alessandra Giardini、Matilde Guala、Elena La Porta、Paola Petrillo、Stefano Radaelli、Luigi Radice、Luca F. Raveglia、Enza Santoro、Roberta Scudellaro、Francesca Scarpitta、Chiara Bigogno、Paola Misiano、Giulio M. Dondio、Andrea Rizzi、Elisabetta Armani、Gabriele Amari、Maurizio Civelli、Gino Villetti、Riccardo Patacchini、Marco Bergamaschi、Maurizio Delcanale、Carolina Salcedo、Andrés G. Fernández、Bruno P. Imbimbo
DOI:10.1021/jm061159a
日期:2007.4.1
Pharmacophore-based structural identification, synthesis, and structure-activity relationships of a new class of muscarinic M3 receptor antagonists, the diaryl imidazolidin-2-one derivatives, are described. The versatility of the discovered scaffold allowed for several structural modifications that resulted in the discovery of two distinct classes of compounds, specifically a class of tertiary amine derivatives (potentially useful for the treatment of overactive bladder by oral administration) and a class of quaternary ammonium salt derivatives (potentially useful for the treatment of respiratory diseases by the inhalation route of administration). In this paper, we describe the synthesis and biological activity of tertiary amine derivatives. For these compounds, selectivity for the M3 receptor toward the M2 receptor was crucial, because the M2 receptor subtype is mainly responsible for adverse systemic side effects of currently marketed muscarinic antagonists. Compound 50 showed the highest selectivity versus M2 receptor, with binding affinity for M3 receptor K-i = 4.8 nM and for M2 receptor K-i = 1141 nM. Functional in vitro studies on selected compounds confirmed the antagonist activity toward the M3 receptor and functional selectivity toward the M2 receptor.