Used as a key chiral intermediate in the synthesis of antiviral drugs, particularly entecavir for the treatment of chronic hepatitis B (HBV). It serves as a building block in the production of nucleoside analogs, with its ethynyl group protected by a 2,2-dimethyl-1,3-dioxolane ring, enabling selective modification in pharmaceuticals targeting DNA viruses. This structure allows the compound to mimic natural nucleosides while providing resistance to degradation by viral enzymes. Commonly employed in the development of antiviral agents due to its stability and versatility. Also utilized in asymmetric synthesis to introduce chirality in complex organic molecules, enhancing the efficacy and specificity of active pharmaceutical ingredients.