Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors for cancer treatment. Commonly employed in medicinal chemistry for constructing quinazoline-based bioactive molecules. Also utilized in research for preparing fluorescent probes and optoelectronic materials due to its aromatic structure. Serves as a building block in cross-coupling reactions like Suzuki and Buchwald-Hartwig aminations to generate diverse quinazoline derivatives with potential biological activity.