4-Chloro-6-ethoxyquinazoline is primarily used in the field of medicinal chemistry as a key intermediate in the synthesis of various biologically active compounds. Its structure is particularly valuable in the development of kinase inhibitors, which are crucial in targeting specific enzymes involved in cancer and other diseases. Researchers utilize this compound to modify and optimize drug candidates, enhancing their efficacy and selectivity. Additionally, it serves as a building block in the creation of quinazoline derivatives, which are explored for their potential therapeutic applications in treating conditions like inflammation, microbial infections, and neurological disorders. Its role in drug discovery underscores its importance in advancing pharmaceutical research and development.