A New Series of 2-Alkoxy(aralkoxy)-[1,2,4]triazolo[1,5-a]quinazolin-5-ones as Adenosine Receptor Antagonists

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This research was carried out to study the pharmacological activity of a newly synthesized series of 2-alkoxy-[1,2,4]triazolo[1,5-a]quinazolin-5-ones as adenosine receptor antagonists. These compounds have been tested in radioligand binding assays on cloned Chinese hamster ovary (CHO) cells transfected with A1, A2A, A2B and A3 receptors. In particular, among the triazoloquinazolines (1—11), the dialkoxy derivative (7b) was found to have the highest affinity at A1 subtype receptor, and its radioligand binding activity together with 1,3-dipropyl-8-cyclopentylxanthine (DPCPX) was studied. Finally, the structure–activity relationship (SAR) studies on the titled compounds provide some new insights about steric hindrance and lipophilic requirements for anchoring to the adenosine receptors recognition site.