Pyrazolo 3,4-g quinoxaline compounds that inhibit PDGF receptor protein tyrosine kinase

摘要

This invention relates to pyrazolo[3,4-g]quinoxaline compounds exhibiting protein tyrosine kinase inhibition activity of the formula: IMAGE where: ------ may be a double bond; R, R2, R3 and R4 are as described in claim 1; a pharmaceutically acceptable salt thereof. More specifically, compounds of this invention are novel as selective inhibitors of the PDGF-R protein tyrosine kinase and can be applied as potential therapeutic agents for various disease states which are characterized by uncontrolled cellular proliferation. Further, the present invention provides pharmaceutical compositions and a method for treating such disorders comprising the administration to a patient of a PDGF receptor inhibiting effective amount of a pyrazolo[3,4-g]quinoxaline compound exhibiting protein tyrosine kinase inhibition activity. Processes for the preparation of pyrazolo[3,4-g]quinoxaline compounds are also described.