Used as a key intermediate in the synthesis of pharmaceutical agents, particularly in the development of kinase inhibitors for cancer treatment. It serves as a building block in medicinal chemistry for constructing quinazoline-based compounds that exhibit antitumor, antiviral, and anti-inflammatory activities. Its functional groups allow for selective modifications, enabling the optimization of biological activity and pharmacokinetic properties in drug candidates. Commonly employed in research settings for designing targeted therapies, especially in EGFR (epidermal growth factor receptor) inhibitor development.