Design, synthesis, and evaluation of fibrinogen inhibitors, ω-(p-amidinophenoxy) alkanoylaspartic acid derivatives

QSAR study of the peptidic fibrinogen inhibitors FK633, FR158999 and related derivatives, using a novel and useful hydrophobic descriptor (logPmw)

A QSAR study using the novel hydrophobic descriptor (logPmw), which is a descriptor for membrane affinity, of our fibrinogen inhibitors FK633 (1), FR158999 (21), and related derivatives was performed, and resulted in good correlation (n = 19, s = 0.268, F = 6.38**, r = 0.667). Based on these results, we constructed a hypothesis by which these potent inhibitors bind to the receptor via the biomembrane and the C-terminal moiety functions as an anchor moiety.

Quantitative structure-activity relationship study of fibrinogen inhibitors, [[4-(4-amidinophenoxy)butanoyl]aspartyl]valine (FK633) derivatives, using a novel hydrophobic descriptor

We recently reported a novel hydrophobic descriptor for quantitative structure-activity relationship (QSAR) studies, the logarithm of the partition coefficient micelle/water (log Pmw), which is easily determined by a HPLC system and is thought to be a descriptor for a compound's affinity to a biomembrane. We carried out QSAR studies using log Pmw on the antiplatelet activities of novel fibrinogen inhibitors, [[4-(4-amidinophenoxy)butanoyl]aspartyl]valine (FK633) derivatives, which resulted in a quadratic curve with a good correlation coefficient (n = 12, s = 0.368, F = 14.1**, r = 0.871), indicating that a suitable membrane affinity of the fibrinogen inhibitors is vital for their inhibitory activities. QSAR studies using STERIMOL parameters and/or CLOGP values were unsuccessful.