Journal
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
Volume 13, Issue 14, Pages 2363-2367Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0960-894X(03)00398-6
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A solution-phase synthesis of an alpha-ketothiazole library of the general form D-Phe-L-AA-L-Arg-alpha-ketothiazole is described. The five-step synthesis is accomplished using a combination of polymeric reagents and polymer-assisted solution-phase purification protocols, including reactant-sequestering resins, reagent-sequestering resins, and tagged reagents. The multi-step synthesis affords the desired alpha-ketothiazole products in excellent purities and yields. A variety Of L-amino acid inputs were used to probe the S2 pocket of the tissue factor (TF) Vila enzyme to influence both potency and selectivity. An X-ray crystal structure of compound 10e bound to the TF/VIIa complex was obtained that explains the observed selectivity. The alpha-ketothiazoles were found to be potent, reversible-covalent inhibitors of tissue factor VIIa, with some analogues demonstrating selectivity versus thrombin. (C) 2003 Elsevier Science Ltd. All rights reserved.
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