3 research outputs found

    Selective <i>I</i><sub>Kur</sub> Inhibitors for the Potential Treatment of Atrial Fibrillation: Optimization of the Phenyl Quinazoline Series Leading to Clinical Candidate 5‑[5-Phenyl-4-(pyridin-2-ylmethylamino)quinazolin-2-yl]pyridine-3-sulfonamide

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    We have recently disclosed 5-phenyl-<i>N</i>-(pyridin-2-ylmethyl)-2-(pyrimidin-5-yl)­quinazolin-4-amine <b>1</b> as a potent <i>I</i><sub>Kur</sub> current blocker with selectivity versus <i>h</i>ERG, Na and Ca channels, and an acceptable preclinical PK profile. Upon further characterization <i>in vivo</i>, compound <b>1</b> demonstrated an unacceptable level of brain penetration. In an effort to reduce the level of brain penetration while maintaining the overall profile, SAR was developed at the C2′ position for a series of close analogues by employing hydrogen bond donors. As a result, 5-[5-phenyl-4-(pyridin-2-ylmethylamino)­quinazolin-2-yl]­pyridine-3-sulfonamide (<b>25</b>) was identified as the lead compound in this series. Compound <b>25</b> showed robust effects in rabbit and canine pharmacodynamic models and an acceptable cross-species pharmacokinetic profile and was advanced as the clinical candidate. Further optimization of <b>25</b> to mitigate pH-dependent absorption resulted in identification of the corresponding phosphoramide prodrug (<b>29</b>) with an improved solubility and pharmacokinetic profile

    Discovery of Potent and Orally Bioavailable Dihydropyrazole GPR40 Agonists

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    G protein-coupled receptor 40 (GPR40) has become an attractive target for the treatment of diabetes since it was shown clinically to promote glucose-stimulated insulin secretion. Herein, we report our efforts to develop highly selective and potent GPR40 agonists with a dual mechanism of action, promoting both glucose-dependent insulin and incretin secretion. Employing strategies to increase polarity and the ratio of sp<sup>3</sup>/sp<sup>2</sup> character of the chemotype, we identified BMS-986118 (compound <b>4</b>), which showed potent and selective GPR40 agonist activity <i>in vitro</i>. <i>In vivo</i>, compound <b>4</b> demonstrated insulinotropic efficacy and GLP-1 secretory effects resulting in improved glucose control in acute animal models
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