Journal
BIOORGANIC & MEDICINAL CHEMISTRY
Volume 12, Issue 7, Pages 1713-1730Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2004.01.016
Keywords
SSR182289A; thrombin inhibitor; L-arg surrogate; oral antithrombotic
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SSR182289A 1 is the result of a rational optimisation process leading to an orally active thrombin inhibitor. The structure incorporates an original 2-(acetylamino)-[1,1'-biphenyl]-3-sulfonyl N-terminal motif, a central L-Arg surrogate carrying a weakly basic 3-amino-pyridine, and an unusual 4-difluoropiperidine at the C-terminus. Its synthesis is convergent and palladium catalysis has been employed for the construction of the key C-C bonds: Suzuki coupling for the bis-aryl fragment and Sonogashira reaction for the delta-epsilon bond of the central amino-acid chain. The compound is a potent inhibitor of thrombin's activities in vitro and demonstrates potent oral anti-thrombotic potencies in three rat models of thrombosis. The observed in vitro potency could be rationalized through the examination of the interactions within the SSR182289A 1 - thrombin crystal structure. SSR182289A 1, has been therefore selected for further development. (C) 2004 Elsevier Ltd. All rights reserved.
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