Journal of Medicinal Chemistry p. 4779 - 4789 (1992)
Update date:2022-08-04
Topics:
Wissner
Carroll
Johnson
Kerwar
Pickett
Schaub
Torley
Trova
Kohler
A series of bis-aryl amide (13-57 and 66-81) and bis-aryl urea (58 and 85) antagonists of platelet-activating factor (PAF) was prepared that contain, separating the two aromatic rings, linear amide linkages of the form - (CH2)(n)CONH- (n = 0-2), -OCH2CONH-, and -(CH2)(n)NHCO- (n = 0-1), branched amide linkages of the form -(CH2)(n)N(COR)- (n = 1-3, R = CH3 or n-C3H7), and -N(COCH3)CH2-, and urea linkages of the form -NHCONH- and - CH2N(CONHCH3)-. These compounds were examined for their ability to inhibit PAF-induced platelet aggregation of rabbit platelets. These in vitro data were compared to similar data obtained for a number of known PAF antagonists. The compounds were evaluated in vivo, in the mouse, for their ability to prevent death induced by a lethal challenge of PAF. The relationships between the biological activity and the nature, lipophilicity, and position of substituents of the aromatic rings were studied. Best activity was observed for compounds having linkages of the type -CH2CONH-, -CH2N(COR)-, and - CH2NHCO-. Many of these compounds inhibit PAF-induced platelet aggregation with IC50's under 1 μM.
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