Ethyl 1-aminocyclopropanecarboxylate hydrochloride is primarily used in organic synthesis as a building block for the preparation of more complex molecules. It serves as a key intermediate in the development of pharmaceuticals, particularly in the synthesis of compounds with potential biological activity. Its cyclopropane ring structure is valuable in medicinal chemistry for creating molecules with unique conformational properties, which can enhance drug efficacy or selectivity. Additionally, it is utilized in research settings for studying chemical reactions involving strained ring systems, providing insights into reaction mechanisms and stability.