Used as a key intermediate in the synthesis of quinazoline-based pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer therapy. Its halogen substitution pattern allows for selective cross-coupling reactions, enabling the introduction of functional groups to optimize biological activity. Commonly employed in medicinal chemistry research for generating novel analogs with potential antitumor and anti-inflammatory properties. Also utilized in the preparation of fluorescent probes and labeled compounds for biochemical assays due to its reactive halogens and stable heterocyclic core.