The present invention relates to pyrazolo [1,5 -a] [1,3,5 ]triazine and pyrazolo[1,5-a] pyrimidine derivatives and/or pharmaceutically acceptable salts thereof, the use of these derivatives as pharmaceutically active agents, especially for the prophylaxis and/or treatment of cell proliferative diseases, inflammatory diseases, immunological diseases, cardiovascular diseases and infectious diseases. Furthermore, the present invention is directed towards pharmaceutical compositions containing at least one of the pyrazo lo [1,5-a][1,3,5 ]triazine and pyrazolo [1,5-a]pyrimidine derivatives and/or pharmaceutically acceptable salts thereof.