PROCESS FOR PRODUCING DIMIDAZO AND IMIDAZOPYRAZOLOPYRIMIDINES HAVING A SELECTIVE EFFECT ON ADENOSINE RECEPTORS AS WELL AS PHARMACEUTICAL COMPOSITIONS COMPRISING SAME

Adenosine analogues of formule (I) which act selectively at adenosine receptors and which act in general as adenosine antagonists are disclosed. From in vitro studies it is known that specific physiological effects can be distinguished as a result of this selectivity and that adenosine receptor activity in vitro correlates with adenosine receptor activity in vivo. Pharmaceutical preparations of the subject compounds can be prepared on the basis of the selective binding activity of the compounds disclosed herein which can be expected to enhance certain physiological effects while minimizing others, such as decreasing blood pressure without decreasing heart rate. wherein R1 is hydrogen, phenyl or beta -D-ribofuranosyl; R2 is hydrogen, lower alkyl of from 1 to 4 carbon atoms or lower alkoxy of from 1 to 4 carbon atoms; Y is -N= or -CH=; Z is -N= or -CH=, with the proviso that Y and Z are not identical; n is an integer from 1 to 3, L is hydrogen or phenyl; and M is phenyl, except when L is phenyl, in which case M is hydrogen or a lower alkyl of from 1 to 3 carbon atoms.