Used as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer treatment. It serves as a building block in medicinal chemistry due to its reactive halogen sites, which allow for further functionalization through cross-coupling reactions. Commonly employed in the preparation of bioactive quinazoline derivatives with potential antitumor, antimicrobial, and anti-inflammatory properties. Its structure supports the design of targeted therapies, especially in EGFR (epidermal growth factor receptor) inhibitor research.