Used as an 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 bioactive molecules due to its ability to undergo nucleophilic substitution at the 4-position, allowing for the introduction of various functional groups. Commonly employed in medicinal chemistry for structure-activity relationship studies in drug discovery programs targeting tyrosine kinase receptors. Also utilized in the production of agrochemicals and dyes where a halogenated quinazoline scaffold enhances reactivity or binding properties.