Used as a key intermediate in the synthesis of pharmaceutical agents, particularly in the development of kinase inhibitors for cancer treatment. Its structure allows for selective modification, making it valuable in creating compounds that target specific signaling pathways in tumor cells. Commonly employed in medicinal chemistry research to build quinazoline-based drug candidates with potential activity against EGFR and other tyrosine kinases. Also utilized in the preparation of antiviral and anti-inflammatory agents due to its ability to modulate biological activity when appropriately substituted.