title: New oxadiazole derivatives showing partly antiplatelet, antithrombotic and serotonin antagonistic properties.
abstract: Ten new 1, 2, 4-oxadiazole- and six new 1, 3, 4-oxadiazole-carboxamides containing different lipophilic moieties (i.e. 4-biphenyl-, 1-naphthyl, phenylpropyl- and n-hexyl substituents) and additional basic groups which are mainly alkyl- and dialkylaminoalkyl residues have been synthesized and tested for antiplatelet effects in vitro (Born-test) and antithrombotic properties in vivo (laser thrombosis model). If the platelet aggregation was induced by collagen, the inhibitory effects (IC50) were between 58 microM and 300 microM. Using serotonin (5-HT) as an inducer, compound 6a (N-(3-dimethylaminopropyl-5-(biphenyl-4-yl)-1, 3, 4-oxadiazole-2-carboxamide) had an IC50 = 1 microM (12e: (N-3-Dimethylaminopropyl)-3-(1-naphthyl)-1, 2, 4-oxadiazole-5-carboxamide, 6.7 microM). In an in vitro rat tail artery assay 6a and 12e behaved as a competitive 5-HT2A receptor antagonist (6a: pKB = 6.86 +/- 0.04; 12e: pKB = 6.66 +/- 0.05). The antithrombotic effects of some compounds were small but significant (7-10 % inhibition of thrombus formation).
authors.affiliation: Institut für Pharmazie, Freie Universität Berlin, Berlin, Germany.
authors.forename: Katrin
authors.initials: K
authors.lastname: Bethge
authors.forename: Heinz H
authors.initials: HH
authors.lastname: Pertz
authors.forename: Klaus
authors.initials: K
authors.lastname: Rehse
mesh_terms: D005343:Fibrinolytic Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D006801:Humans; D010069:Oxadiazoles / Q000138:chemical synthesis* / Q000494:pharmacology; D010974:Platelet Aggregation / Q000187:drug effects; D058830:Serotonin 5-HT2 Receptor Antagonists; D013329:Structure-Activity Relationship
chemical_list: D005343:Fibrinolytic Agents; D010069:Oxadiazoles; D058830:Serotonin 5-HT2 Receptor Antagonists