6-Bromo-2-oxindole is widely used as a key intermediate in the synthesis of biologically active compounds, particularly in pharmaceutical research. It serves as a building block for the development of kinase inhibitors, which are important in cancer therapy. Its structure allows for selective functionalization, making it valuable in the creation of indole-based drug candidates. It is also employed in the preparation of serotonin receptor modulators and other neuroactive agents. Due to the presence of the bromine atom, it readily participates in cross-coupling reactions such as Suzuki and Heck reactions, enabling the efficient construction of complex molecules for drug discovery and medicinal chemistry.