3-Ethylpyridine-4-boronic acid is primarily used in organic synthesis, particularly in Suzuki-Miyaura cross-coupling reactions. This reaction is essential for forming carbon-carbon bonds, enabling the creation of complex organic molecules. The compound serves as a versatile building block in the synthesis of pharmaceuticals, agrochemicals, and advanced materials. Its boronic acid group facilitates efficient coupling with aryl halides, making it valuable in the production of biaryl compounds. Additionally, it is employed in the development of sensors and catalysts due to its ability to interact with various organic and inorganic substrates. Its applications extend to research in medicinal chemistry, where it aids in the design and synthesis of novel drug candidates.