Used as a key 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 its ability to form stable heterocyclic structures that interact with biological targets. Commonly employed in the preparation of active pharmaceutical ingredients (APIs) targeting respiratory diseases and inflammatory conditions. Its chloro functional group allows for easy substitution, enabling the introduction of various side chains to optimize drug efficacy and selectivity.