- PYRAZOLO (1,5A) 1,3,5-TRIAZINES
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Pyrazolo[1,5a]1,3,5-triazines are disclosed which are useful as inhibitors of phosphodiesterase enzymes or intermediate in the production process. Such triazines are of general structure: wherein R1, R2 and R3 are as defined hereinafter, or heterocyclic derivatives thereof. Also disclosed are substituted pyrazole derivatives which are used to prepare the pyrazolo[1,5a]1,3,5-triazines of this invention
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