The structure-activity relationship (SAR) of the lactone ring of himbacine derived thrombin receptor (PAR-1) antagonists (e.g., 2-5) is described. The effect of the lactone carbonyl group on binding to PAR-1 is dependent on the substitution pattern of the pyridine ring. A stereoselective intramolecular Michael addition reaction to the vinyl pyridine group was observed for these pyridine analogs of himbacine in basic conditions at elevated temperature.
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| http://dx.doi.org/10.1016/j.bmcl.2006.06.042 | DOI Listing |
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