RESUMO
We report the development of aryl sulfones as Bradykinin B1 receptor antagonists. Variation of the linker region identified diol 23 as a potent B1 antagonist, while modifications of the aryl moiety led to compound 26, both of which were efficacious in rabbit biochemical challenge and pain models.
Assuntos
Antagonistas de Receptor B1 da Bradicinina , Dor/tratamento farmacológico , Sulfonas/farmacologia , Animais , Anti-Inflamatórios não Esteroides/administração & dosagem , Anti-Inflamatórios não Esteroides/farmacologia , Antagonistas de Receptor B2 da Bradicinina , Doença Crônica , Humanos , Coelhos , Ratos , Ratos Sprague-Dawley , Sulfonas/administração & dosagemRESUMO
The bradykinin B1 receptor is induced following tissue injury and/or inflammation. Antagonists of this receptor have been studied as promising candidates for treatment of chronic pain. We have identified aryl sulfonamides containing a chiral chroman diamine moiety that are potent antagonists of the human B1 receptor. Our previously communicated lead, compound 2, served as a proof-of-concept molecule, but suffered from poor pharmacokinetic properties. With guidance from metabolic profiling, we performed structure-activity relationship studies and have identified potent analogs of 2. Variation of the sulfonamide moiety revealed a preference for 3- and 3,4-disubstituted aryl sulfonamides, while bulky secondary and tertiary amines were preferred at the benzylic amine position for potency at the B1 receptor. Modifying the beta-amino acid core of the molecule lead to the discovery of highly potent compounds with improved in vitro pharmacokinetic properties. The most potent analog at the human receptor, compound 38, was also active in a rabbit B1 receptor cellular assay. Furthermore, compound 38 displayed in vivo activity in two rabbit models, a pharmacodynamic model with a blood pressure readout and an efficacy model of inflammatory pain.