(4-ethylpyrimidin-5-yl)boronic acid is primarily utilized in organic synthesis, particularly in cross-coupling reactions, such as Suzuki-Miyaura reactions. These reactions are essential for forming carbon-carbon bonds, making it valuable in the production of pharmaceuticals, agrochemicals, and advanced materials. Its boronic acid group acts as a key intermediate, enabling the construction of complex organic molecules. Additionally, it is employed in the development of bioactive compounds and drug discovery, where it serves as a building block for creating molecules with potential therapeutic properties. Its role in catalysis and material science further highlights its versatility in modern chemical research and industrial applications.