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
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