Used as a key intermediate in the synthesis of quinazoline-based pharmaceuticals, particularly in the development of kinase inhibitors for cancer treatment. Its structure allows for selective substitution at the 7-position, enabling the creation of targeted biologically active compounds. Commonly employed in medicinal chemistry research for designing drugs with antitumor, antiviral, and anti-inflammatory properties. Also utilized in the preparation of fluorescent probes and heterocyclic compounds for biochemical assays.