Used as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer treatment. It serves as a building block in medicinal chemistry due to the reactivity of the chloropyrimidine ring, allowing for selective substitutions that lead to biologically active molecules. Commonly employed in the preparation of targeted therapies, including inhibitors of EGFR, ALK, and other tyrosine kinases. Its tert-butoxycarbonyl (Boc) protecting group stabilizes the amine during synthesis and can be easily removed under mild acidic conditions, enabling further functionalization in multi-step reactions. Also utilized in agrochemical research for designing novel active ingredients with improved selectivity and stability.