DL-2,3-Diaminopropionic acid is a free amino acid derivative classified as a diamino acid, featuring a three-carbon backbone bearing two primary amine substituents at the 2- and 3-positions along with a carboxylic acid group. The molecule exists as a DL mixture, providing stereochemical forms that are not distinguished in the name, and it presents multiple basic side-chain functionalities that can participate in salt formation and acid-base equilibria while remaining chemically distinct from standard single-side-chain amino acids. In research and synthesis, it is used as a building block for preparing polyamine-containing peptides, peptidomimetics, and other nitrogen-rich amino acid derivatives, as well as for constructing labeled or functionalized frameworks where the additional amino group provides a handle for further derivatization or conjugation.
CAT No: CP05803
DL-2,3-Diaminopropionic acid is a diamino acid with the formula H2N-CH2-CH(NH2)-CO2H, featuring two primary amine functionalities and a carboxylic acid that together enable strong acid-base and nucleophilic behavior. The molecule exists as a DL mixture at the stereogenic center (2-position), providing access to both enantiomeric configurations for comparative studies and racemate-based synthesis planning. The presence of two amino groups allows orthogonal derivatization strategies, including selective N-protection to direct peptide coupling at a chosen nitrogen while leaving the other available for subsequent functionalization. As an amino acid building block and synthetic intermediate, it can be converted into protected amino acid derivatives, amino acid salts, or activated carboxyl derivatives, supporting downstream construction of diamino-containing motifs in peptides and heterocycle-forming sequences.
1. Peptide Synthesis
DL-2,3-Diaminopropionic acid serves in peptide synthesis workflows where diamino motifs are required for backbone-modulating analogs and side-chain-rich peptide architectures. The carboxylic acid participates in standard peptide coupling after conversion to an activated ester or acid chloride equivalent, while the two primary amines can be managed through N-protection to control which nitrogen becomes the peptide-forming site. Orthogonal protection patterns can support stepwise assembly, enabling selective deprotection for subsequent intramolecular cyclization or for post-coupling functionalization of the remaining amino group. Diaminopropionic acid residues incorporated into peptides can be used to tune charge density and hydrogen-bonding capacity in peptide libraries and peptide-based research reagents.
2. Amino Acid Derivatization
DL-2,3-Diaminopropionic acid is suitable for amino acid derivatization chemistry aimed at generating N-substituted derivatives, amino acid esters, and protected intermediates used in fine chemical synthesis. The dual amine functionality enables sequential functional group transformations such as selective acylation, sulfonylation, or carbamate formation to create orthogonally protected species that can survive coupling conditions and then be removed under controlled deprotection regimes. The carboxylic acid can be esterified to support solubility tuning and to facilitate downstream coupling chemistry, including preparation of peptidomimetic fragments. Resulting derivatives can be applied as chiral or racemic building blocks for constructing amino-rich scaffolds, including diamino-containing linkers and constrained amino acid analogs.
3. Chiral Building Block Development
DL-2,3-Diaminopropionic acid can be used as a racemic feedstock for chiral building block development when enantiomeric separation or stereochemical assignment is required for structure-activity relationship studies. The stereogenic center at the 2-position allows the compound to be transformed into protected amino acid intermediates whose stereochemistry can be preserved during N-protection, carboxyl activation, and subsequent coupling steps. Selective protection of one amine can reduce side reactions and improve control over which nitrogen participates in peptide bond formation, supporting reproducible stereochemical outcomes in downstream synthesis. Enantiomer-resolved or stereochemically defined derivatives derived from this diamino acid can then be incorporated into unnatural amino acid sequences and chiral peptidomimetic constructs for stereochemical comparison.
4. Bioconjugation Chemistry
DL-2,3-Diaminopropionic acid supports bioconjugation and chemical biology workflows through its two primary amines, which can be converted into reactive handles for covalent attachment to biomolecules. The carboxylic acid enables formation of amide or ester-linked intermediates, while protected amines can be deprotected at controlled stages to introduce conjugation-ready functional groups without uncontrolled crosslinking. N-protection strategies can help manage chemoselectivity during coupling to activated biomolecule scaffolds such as carboxyl-activated carriers or electrophilic labeling reagents. Diamino-containing conjugates prepared from this intermediate can function as linkers, spacer units, or charge-modulating components in labeled peptides, protein conjugates, and biomolecule modification studies.
5. Heterocycle Synthesis
DL-2,3-Diaminopropionic acid is applicable to heterocycle synthesis routes where adjacent amino functionalities enable cyclization to nitrogen-rich ring systems. The combination of a carboxylic acid and two primary amines can be transformed into appropriately protected or activated intermediates that undergo intramolecular reactions to form cyclic ureas, amidines, or other nitrogen-containing frameworks, depending on the chosen activation and protection pattern. Carboxyl activation and selective N-protection can direct ring closure while minimizing polymerization or overreaction from the second amine. Nitrogen-rich heterocycles derived from this diamino acid can serve as scaffolds for medicinal chemistry research, peptide-mimetic design, and industrial fine chemical synthesis of heteroatom-functional building blocks.
6. Pharmaceutical Intermediate Preparation
DL-2,3-Diaminopropionic acid can be used in pharmaceutical intermediate preparation for manufacturing of amino acid-derived fragments, diamino-containing linkers, and protected building blocks used in synthetic pipelines. The molecule's carboxylic acid can be converted into protected amino acid derivatives suitable for controlled coupling chemistry, while the two primary amines can be managed via protection-group selection to match process conditions and downstream deprotection windows. Racemic input can be relevant for process development stages where stereochemical resolution occurs later or where both enantiomers are evaluated in parallel synthetic routes. Downstream derivatives prepared from this diamino acid can feed into larger synthetic sequences that require predictable functional group reactivity and compatibility with peptide coupling and amide-forming transformations.
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