(5-Cyanobenzo[b]thiophen-2-yl)boronic acid is primarily used in organic synthesis, particularly in Suzuki-Miyaura cross-coupling reactions. This reaction is widely employed to form carbon-carbon bonds, making it valuable in the production of pharmaceuticals, agrochemicals, and advanced materials. The boronic acid group in the compound acts as a key functional group, enabling the coupling with various aryl or vinyl halides in the presence of a palladium catalyst. Its application extends to the development of complex organic molecules, including biologically active compounds and organic electronic materials. Additionally, the cyano group on the benzo[b]thiophene ring can enhance the compound's reactivity and provide a handle for further chemical modifications. This makes it a versatile intermediate in medicinal chemistry and material science research.