Used primarily in organic synthesis, this compound serves as a key intermediate in the preparation of various heterocyclic compounds. It is particularly valuable in the development of pharmaceuticals, where it is employed to introduce the quinoline moiety into drug molecules. Additionally, it is utilized in the creation of dyes and pigments, leveraging its sulfonyl chloride group for coupling reactions. Its role in research includes the study of enzyme inhibitors and receptor antagonists, making it a versatile tool in medicinal chemistry.