Used as a key intermediate in the synthesis of kinase inhibitors, particularly in pharmaceutical research targeting cancer therapies. It shows utility in developing compounds that modulate protein kinases involved in cell signaling, proliferation, and apoptosis. Its structure allows for selective modifications, making it valuable in optimizing drug candidates for improved potency and selectivity. Commonly employed in medicinal chemistry for structure-activity relationship (SAR) studies within pyrido-pyrimidine based drug development programs.