Abstract
Starting from the achiral and potent factor Xa inhibitor 1, a new and flexible solid-phase optimisation strategy is described to reduce its cationic character. By replacing one positively charged side chain by a lipophilic substituent, a novel series of highly potent and selective achiral factor Xa inhibitors was discovered. The identified lipophilic replacements in the S4 pocket might be valuable for other approaches towards fXa inhibitors.
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