Allo-DL-3-Thiobutyrine is a sulfur-containing, non-proteinogenic amino acid derivative classified as an allo- and DL-mixture of 3-thiobutyrine, featuring a four-carbon backbone bearing a thiol-containing side chain at the 3-position. The molecule contains both an amino group and a carboxyl functional group, with the side-chain sulfur providing nucleophilic and redox-active character that can participate in thiol-disulfide exchange or form thioether linkages under appropriate conditions, while the "allo" designation indicates a specific stereochemical relationship within the side-chain arrangement and "DL" denotes a racemic mixture at the stereocenter(s) present. As a chemically functional amino acid building block, it is used in peptide and amino acid derivative synthesis and in chemical biology workflows where thiol functionality is required for conjugation, crosslinking, or analytical method development based on sulfur-containing substrates.
CAT No: CP09203
Allo-DL-3-Thiobutyrine is an allo-DL stereochemical mixture of 3-thiobutyric acid, providing a thio-functionalized, sulfur-containing carboxylic acid building block. Its thiol-containing chemistry makes it relevant for preparing sulfur-modified intermediates and for constructing thioether- or thioester-containing structures where controlled reactivity at sulfur is required. As a small-molecule amino-acid-like precursor, it is commonly handled in synthetic and analytical workflows that benefit from a defined sulfur motif rather than from protein-incorporation chemistry.
1. Sulfur-Containing Intermediate Synthesis
Allo-DL-3-Thiobutyrine is used as a sulfur-bearing intermediate for the preparation of thioester and thioether derivatives in pharmaceutical intermediate development and specialty chemical manufacturing. Researchers and process chemists select the 3-thiobutyric acid motif to introduce a three-carbon chain bearing a sulfur functionality that can be further functionalized downstream toward more complex sulfur-containing scaffolds. The allo-DL mixture form is often leveraged when stereochemical purity is not the primary requirement for the next synthetic step, enabling practical scale-up and flexible route development.
2. Thioether and Thioester Building Blocks
Allo-DL-3-Thiobutyrine serves as a feedstock for generating thioether-linked structures and sulfur-activated derivatives used in medicinal chemistry programs and chemical biology reagent synthesis. Teams developing mechanistic probes or substrate analogs frequently rely on sulfur-containing linkers to tune chemical reactivity and to provide handles for subsequent coupling, activation, or derivatization. In these workflows, the defined carboxylic acid functionality supports straightforward conversion into downstream reactive forms, while the sulfur group provides the key transformation point for installing thioether or thioester connectivity.
3. Analytical Reference for Sulfur Chemistry
Allo-DL-3-Thiobutyrine is also used as a reference material in analytical method development targeting sulfur-containing small molecules, including LC-MS workflows that monitor thio-functionalized metabolites or synthetic intermediates. Analytical chemists value such amino-acid-like sulfur standards for retention-time anchoring and for generating calibration or qualification signals when developing assays for sulfur motif-containing analytes. The allo-DL mixture is particularly useful when the analytical method is designed to quantify total compound-related signal rather than distinguish stereoisomer-specific species.
4. Chiral and Stereochemical Derivatization Studies
Allo-DL-3-Thiobutyrine can be employed in stereochemical studies and chiral derivatization strategies where a sulfur-containing carboxylic acid is converted into diastereomeric derivatives for separation or characterization. Research groups working on chiral resolution, stereochemical assignment, or method qualification may choose this stereochemical mixture to evaluate separation performance across stereoisomeric forms. This application is most relevant when the downstream analytical or synthetic step explicitly addresses stereochemistry rather than requiring the starting material to be enantiopure.
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