Himbacine-Derived Thrombin Receptor Antagonists: C<sub>7</sub>‑Spirocyclic Analogues of Vorapaxar
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Abstract
We
have synthesized several C<sub>7</sub>-spirocyclic analogues of vorapaxar
and evaluated their in vitro activities against PAR-1 receptor. Some
of these analogues showed activities and rat plasma levels comparable
to vorapaxar. Compound <b>5c</b> from this series showed excellent
PAR-1 activity (<i>K</i><sub>i</sub> = 5.1 nM). We also
present a model of these spirocyclic compounds docked to the PAR-1
receptor based on the X-ray crystal structure of vorapaxar bound to
PAR-1 receptor. This model explains some of the structure–activity
relationships in this series