The present invention relates to pyrazolo[1,5-a][1,3,5]triazine derivatives and/or pharmaceutically acceptable salts thereof, the use of these derivatives as pharmaceutically active agents, especially for the prophylaxis and/or treatment of infectious diseases, including opportunistic diseases, immunological diseases, autoimmune diseases, cardiovascular diseases, cell proliferative diseases, inflammation, erectile dysfunction and stroke, and pharmaceutical compositions containing at least one of said pyrazolo[1,5-a][1,3,5]triazine derivatives and/or pharmaceutically acceptable salts thereof. Furthermore, the present invention relates to the use of said pyrazolo[1,5-a][1,3,5]triazine derivatives as inhibitors for a protein kinase.
