11 research outputs found

    Discovery of a Potent Parenterally Administered Factor XIa Inhibitor with Hydroxyquinolin-2(1<i>H</i>)‑one as the P2′ Moiety

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    Structure–activity relationship optimization of phenylalanine P1′ and P2′ regions with a phenylimidazole core resulted in a series of potent FXIa inhibitors. Introducing 4-hydroxyquinolin-2-one as the P2′ group enhanced FXIa affinity and metabolic stability. Incorporation of an <i>N</i>-methyl piperazine amide group to replace the phenylalanine improved both FXIa potency and aqueous solubility. Combination of the optimization led to the discovery of FXIa inhibitor <b>13</b> with a FXIa <i>K</i><sub>i</sub> of 0.04 nM and an aPTT EC<sub>2<i>x</i></sub> of 1.0 μM. Dose-dependent efficacy (EC<sub>50</sub> of 0.53 μM) was achieved in the rabbit ECAT model with minimal bleeding time prolongation
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