Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors for cancer treatment. It serves as a building block in the preparation of active pharmaceutical ingredients (APIs) targeting tyrosine kinases and other enzymes involved in signal transduction pathways. Its halogen substituents allow for selective cross-coupling reactions, enabling efficient modification during drug discovery and optimization. Commonly employed in research settings for generating quinazoline-based compounds with potential antitumor, anti-inflammatory, and antimicrobial activities.