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) due to its reactive chlorine and methoxy groups, which allow for selective substitutions. Commonly employed in research and development of targeted therapies, including antitumor and anti-inflammatory agents. Its structure facilitates the formation of quinazoline-based compounds known for high biological activity and selectivity.