Used primarily in organic synthesis as a key intermediate in Suzuki-Miyaura cross-coupling reactions, enabling the formation of carbon-carbon bonds. Its boronate ester group facilitates mild and selective coupling with aryl or heteroaryl halides, making it valuable in the preparation of pharmaceuticals, agrochemicals, and functional materials. The indolin-2-one core is a common scaffold in bioactive molecules, so this compound is particularly useful in drug discovery for constructing kinase inhibitors and other therapeutic agents. It is also employed in the synthesis of fluorescent dyes and optoelectronic materials due to the conjugated structure it can form after coupling.