• Antiparkinsonian activity;
  • Adenosine A2A receptors;
  • Pyrimido[2,1-f]purinedione;
  • Pyrazino[2,1-f]purinedione;
  • Xanthines


The present work describes the synthesis of a pyrazinopurinedione derivative which was together with a series of pyrimidopurinedione derivatives tested for potential antiparkinsonian activity in two tests: the “oxotremorine” and the “reserpine” test. For the studies compounds which had shown affinity for the adenosine A2A receptor were chosen. One compound, a pyrazinopurinedione derivative, without affinity for A2A receptors, but showing adenosine A1 receptor affinity was also investigated. The performed preliminary tests indicated that, contrary to the pyrazinopurinedione all pyrimidopurinediones demonstrated antiparkinsonian effects. As a result of present studies it may be concluded that antiparkinsonian effects of the examined compounds are correlated with the antagonistic activity toward adenosine A2A receptors in this class of compounds. However a direct correlation of the potency of both effects was not observed possibly due to different pharmacokinetic properties of the compounds. The most active derivatives of the present series were aryl-substituted pyrimidopurinediones.