4-Bromo-6-chloroquinazoline is primarily used as a key intermediate in the synthesis of various biologically active compounds, particularly in pharmaceutical research. It serves as a building block for the development of quinazoline derivatives, which are known for their potential therapeutic applications. These derivatives are often explored for their anticancer, antimicrobial, and anti-inflammatory properties. Additionally, the compound is utilized in organic chemistry research to study structure-activity relationships and to design novel drug candidates targeting specific enzymes or receptors. Its halogenated structure makes it a versatile reagent for further functionalization through cross-coupling reactions or nucleophilic substitutions.