Used as a key intermediate in the synthesis of quinazoline-based pharmaceuticals, particularly in the development of tyrosine kinase inhibitors for cancer treatment. Its structure allows selective modification at multiple sites, making it valuable in medicinal chemistry for designing compounds with enhanced binding affinity and metabolic stability. Commonly employed in research settings to develop anticancer, antiviral, and anti-inflammatory agents. Also utilized in the preparation of fluorescent probes due to the inherent photophysical properties of the quinazoline core, supporting applications in bioimaging and molecular sensing.