| abstract |
The invention relates to novel - at least 3,5-disubstituted - pyrazolo[1,5-a]pyrimidines of the formula (I), wherein the symbols R1 to R4 are as defined in the specification, tautomers thereof or N-oxides thereof, or (preferably pharmaceutically acceptable) salts thereof, or hydrates or solvates thereof, as well as to related embodiments. The compounds are useful inter alia as protein kinase inhibitors, and thus e.g. useful in the treatment of diseases that respond to an inhibition of kinases of the PI3-kinase-related protein kinase family, especially lipid kinases and/or PI3 kinase (PI3K) and/or mTOR and/or DNA protein kinase and/or ATM and/or ATR and/or hSMG-1. |