DL-3-Thiobutyrine is a sulfur-containing, non-proteinogenic amino acid derivative classified as a thioether-bearing amino acid analog, featuring a four-carbon backbone with a terminal thiobutyl thioether side chain and both an amino group and a carboxylic acid group. The molecule exists as a racemic (DL) mixture, and the side-chain sulfur provides a thioether functionality that can participate in sulfur-specific chemical transformations and conjugation strategies while the amino and carboxyl groups support salt formation and derivatization. DL-3-Thiobutyrine is used in chemical biology and peptide-related synthesis workflows as a structural probe or building block for preparing modified amino acid and peptide derivatives, as well as in analytical method development where sulfur-containing amino acid analogs are required.
CAT No: CP09201
DL-3-Thiobutyrine is a racemic, sulfur-containing amino acid derivative featuring a four-carbon backbone with a terminal thiol group at the 3-position relative to the carboxyl functionality. The molecule contains a carboxylic acid and a reactive thiol, enabling acid-base behavior and nucleophilic participation in thioalkylation, disulfide formation, and thioester-related transformations. The DL stereochemistry indicates a non-enantiopure mixture at the chiral center, which is often selected for method development, comparative reactivity studies, or downstream conversion where stereochemical resolution is introduced later. The combination of a polar carboxyl group and a thiol provides a practical handle for derivatization to protected or activated forms that integrate into broader amino acid and sulfur chemistry workflows.
1. Sulfur-Containing Building Blocks
DL-3-Thiobutyrine is applied in synthetic organic chemistry as a sulfur-functional precursor for constructing thioether and thioester motifs used in fine chemical synthesis. The thiol group serves as the primary nucleophilic site for alkylation or coupling to electrophiles, while the carboxylic acid can be converted to activated derivatives to control reactivity during multistep sequences. Racemic composition can be maintained through early intermediates when stereochemical purity is not required, then addressed through later resolution or asymmetric introduction of chirality. Downstream, sulfur-functionalized derivatives derived from DL-3-Thiobutyrine can feed into library synthesis and process-oriented intermediate preparation for sulfur-rich target scaffolds.
2. Biochemical Thiol Chemistry
DL-3-Thiobutyrine is utilized in chemical biology research to model or probe thiol reactivity patterns relevant to biomolecule conjugation and redox-active linkages. The free thiol can undergo controlled oxidation to disulfides or participate in thiol-electrophile coupling strategies that mimic cysteine-like behavior in biochemical contexts. The carboxyl functionality supports water-compatible handling and can be used to tune solubility through esterification or salt formation prior to conjugation steps. Resulting thiol-derived conjugates and standards can support studies of linker stability, exchange reactions, and thio-group incorporation into biomolecule-modifying chemistries.
3. Chiral Resolution Intermediates
DL-3-Thiobutyrine is employed as a chiral amino acid intermediate feedstock for stereochemical studies and resolution workflows in process chemistry. The presence of a single stereogenic center allows conversion into diastereomeric derivatives via salt formation or derivatization, enabling separation strategies when enantiopure material is required downstream. The thiol and carboxyl groups can be orthogonally protected or activated to manage chemoselectivity during resolution and subsequent transformations. Enantiopure or stereodefined derivatives obtained from resolved intermediates can then be carried forward into amino acid derivatization routes, stereocontrolled synthesis, and downstream chiral building block manufacturing.
4. Protected Thiol Derivatives
DL-3-Thiobutyrine is suitable for protected amino acid derivative preparation where thiol protection is required to enable selective functional group transformations. The thiol can be masked as a thio-protecting group or converted into a thiol-reactive intermediate while the carboxylic acid is managed as an ester or activated acid derivative to support coupling chemistry. The ability to switch between protected and deprotected states enables sequential assembly of sulfur-containing motifs without premature thiol participation. Protected derivatives derived from DL-3-Thiobutyrine can be used as intermediates for thioether formation, disulfide-linker generation, and synthesis of sulfur-bearing building blocks used in medicinal chemistry and industrial fine chemical production.
5. Analytical Standards And Method Development
DL-3-Thiobutyrine is applied in analytical research as a sulfur-containing reference material for developing and validating detection methods for thiol-bearing amino acid derivatives. The combination of carboxylic acid and thiol enables measurable derivatization signatures under common analytical workflows, supporting calibration and specificity testing for chromatographic and spectrometric assays. Racemic composition can be advantageous when method development targets total analyte quantification rather than enantiomer-resolved profiling. Analytical standards prepared from DL-3-Thiobutyrine can also support impurity tracking and stability assessments for thiol-containing intermediates during synthetic and manufacturing sequences.
6. Industrial Sulfur Intermediate Production
DL-3-Thiobutyrine is relevant to specialty chemical production and process chemistry as a feedstock for manufacturing sulfur-functional intermediates used across downstream synthetic routes. The thiol group supports scalable conversion to thioethers, disulfides, and activated sulfur intermediates, while the carboxyl group provides a handle for controlled activation and incorporation into larger molecules. Racemic starting material can simplify upstream sourcing and handling in industrial settings when stereochemistry is not a critical attribute of the final sulfur-functional product. Sulfur-derived downstream products generated from DL-3-Thiobutyrine can serve as intermediates for industrial fine chemical synthesis, including linker and functional group installation steps in multi-stage manufacturing processes.
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