(R)-2-Aminobut-3-enoic acid hydrochloride is primarily used in the field of organic synthesis and pharmaceutical research. It serves as a key intermediate in the preparation of various biologically active compounds, particularly those involving chiral synthesis. Its enantiomeric purity makes it valuable for developing drugs with specific stereochemical requirements, such as antiviral or anticancer agents. Additionally, it is utilized in peptide synthesis and as a building block for creating complex molecules with potential therapeutic applications. Its unique structure allows for further functionalization, enabling the exploration of novel chemical entities in medicinal chemistry.