R406 is primarily used as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors. It plays a key role in research settings for targeting signaling pathways involved in inflammatory diseases and certain cancers. Due to its reactivity and structural properties, R406 is valuable in optimizing drug candidates for improved potency and selectivity. It is also employed in biochemical assays to study Syk enzyme activity, supporting the discovery of immunomodulatory therapies.