Used as a key 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 biologically active molecules due to its reactive halogen sites, which allow for selective cross-coupling reactions. Commonly employed in medicinal chemistry for structure-activity relationship (SAR) studies, especially in optimizing antiviral and anticancer agents. Its versatility in substitution reactions makes it valuable in creating diverse pyrimidine derivatives for drug discovery programs.