1,2,3-triazolo [4,5-d] pyridazines-V. Preparation and adenosine receptor binding of new 4-amino derivatives.

This paper reports the continuation of studies on the 4-aminosubstituted 1,2,3-triazolo [4,5-d] pyridazine derivatives which had shown binding affinity towards A(1)-adenosine receptors. I-Benzyl derivatives bearing new amines and new 1-(substituted benzyl) derivatives were prepared and tested. The biological results showed that some compounds possessed high affinity (approximate to 30-70 nM) and good selectivity toward the A1-adenosine receptors. Further information about structure-biological activity relationships was aquired.