Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors and other bioactive molecules. Its iodine functionality allows for further modification through cross-coupling reactions, such as Suzuki or Heck couplings, enabling the introduction of diverse aromatic or heteroaromatic groups. Commonly employed in medicinal chemistry for structure-activity relationship (SAR) studies due to the ease of functionalization. Also utilized in the preparation of fluorescent probes and agrochemicals where pyrazine derivatives show biological activity.