L-Thiazolidine-4-carboxylic acid, with the CAS number 34592-47-7, is a chiral sulfur-containing heterocyclic compound, also known as (R)-Thiazolidine-4-carboxylic acid. Its molecular formula is C₄H₇NO₂S, and its molecular weight is 133.17 g/mol. Featuring a five-membered thiazolidine ring (containing one sulfur atom, one nitrogen atom, and three carbon atoms) with a carboxyl group at the 4-position, it possesses unique chiral properties, good chemical stability, and specific biochemical activities, making it widely applied in pharmaceutical synthesis, biochemistry research, and fine chemical production.
Physically, L-Thiazolidine-4-carboxylic acid appears as a white to off-white crystalline powder or granular solid. It has a melting point of approximately 148-152℃ and is soluble in water and common organic solvents such as methanol, ethanol, and dimethylformamide, while insoluble in non-polar solvents. It is optically active, with a specific rotation [α]²⁰/D of +120° to +126° (in water, c=1). It has low hygroscopicity and remains stable under normal temperature and pressure when stored properly, facilitating easy handling, storage, and formulation in various chemical and biological processes.
Chemically, its core thiazolidine ring and chiral center (at the 4-position) are the key features determining its properties. The ring structure is stable under neutral and weakly acidic conditions but may undergo ring-opening reactions under strong acid or strong alkali environments. It contains a carboxyl group and an imino group on the ring, enabling it to participate in esterification, amidation, and coordination reactions. As a chiral building block, it can be used to synthesize compounds with specific stereoconfigurations, which is crucial for pharmaceutical and fine chemical applications.
Its core applications focus on pharmaceutical synthesis and biochemistry research. In the pharmaceutical industry, it serves as a key intermediate for synthesizing antiviral drugs, antibacterial agents, and peptide drugs, especially compounds targeting infectious diseases and metabolic disorders. Its chiral structure ensures the stereoselectivity of the final products, improving their biological activity and reducing side effects.
In biochemistry research, it is used as a biochemical reagent for studying sulfur metabolism, enzyme activity, and chiral recognition, as well as an additive in cell culture media. Additionally, it is applied in fine chemical production to prepare chiral ligands and specialty chemicals. Safety-wise, it is generally recognized as safe (GRAS) under normal handling, with mild irritation potential upon direct contact. It should be stored in a sealed, cool, dry, and dark environment, away from oxidants, moisture, and high temperatures to prevent decomposition. With its unique chiral properties and versatile applications, it is an indispensable raw material in pharmaceutical and life science fields.
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