Used as an intermediate in the synthesis of biologically active compounds, particularly in the development of kinase inhibitors for cancer therapy. Its structure supports binding to enzyme active sites, making it valuable in medicinal chemistry for designing drugs targeting tyrosine kinases. Commonly employed in research settings to develop potential antitumor agents due to the quinazoline core’s affinity for ATP-binding pockets in proteins. Also utilized in the preparation of libraries for high-throughput screening in drug discovery.