Used as an intermediate in the synthesis of biologically active compounds, particularly in pharmaceuticals and agrochemicals. Its sulfonyl chloride group allows for easy attachment to amines or alcohols, forming sulfonamides or sulfonate esters, which are common motifs in drug design. It is also employed in the development of kinase inhibitors and other enzyme modulators due to the quinoxaline core’s affinity for binding biological targets. Additionally, it serves as a building block in the preparation of fluorescent dyes and sensors, where the conjugated structure contributes to light absorption and emission properties.