Used as a key intermediate in the synthesis of pharmaceutical agents, particularly in the development of kinase inhibitors for cancer treatment. It serves as a building block in medicinal chemistry for constructing bioactive molecules targeting tyrosine kinase and other enzyme systems involved in cell signaling. Its structure allows functionalization at multiple sites, enabling optimization of pharmacokinetic properties in drug candidates. Also employed in research settings to explore new quinazoline-based compounds with potential antitumor, anti-inflammatory, or antimicrobial activities.