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      SAR and X-ray structures of enantiopure 1,2-cis-(1R,2S)-cyclopentyldiamine and cyclohexyldiamine derivatives as inhibitors of coagulation Factor Xa.

      Bioorganic & Medicinal Chemistry Letters
      Anticoagulants, chemistry, pharmacology, Binding Sites, Diamines, Factor Xa Inhibitors, Humans, Models, Molecular, Molecular Structure, Prothrombin Time, Structure-Activity Relationship, X-Ray Diffraction

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          Abstract

          In the search of Factor Xa (FXa) inhibitors structurally different from the pyrazole-based series, we identified a viable series of enantiopure cis-(1R,2S)-cycloalkyldiamine derivatives as potent and selective inhibitors of FXa. Among them, cyclohexyldiamide 7 and cyclopentyldiamide 9 were the most potent neutral compounds, and had good anticoagulant activity comparable to the pyrazole-based analogs. Crystal structures of 7-FXa and 9-FXa illustrate binding similarities and differences between the five- and the six-membered core systems, and provide rationales for the observed SAR of P1 and linker moieties.

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