Widely used as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer treatment. Its structure allows for selective functionalization, making it valuable in constructing complex heterocyclic systems found in bioactive molecules. It is also employed in research settings to develop new antiviral and anti-inflammatory agents. Due to the presence of multiple reactive sites, it serves as a versatile building block in medicinal chemistry for creating libraries of quinazoline derivatives during drug discovery.