DL-2-Aminononanoic acid

DL-2-Aminononanoic acid is a nine-carbon, amino acid-type building block with a terminal primary amine at the α-position and a saturated hydrocarbon side chain (linear aliphatic chain) that can participate in both salt formation and standard amino-group chemistry. The compound exists as a racemic mixture (DL), with chirality at the α-carbon, which influences stereochemical outcomes in downstream chiral syntheses and peptide coupling stereoselectivity. The free amine and carboxyl functionality (or corresponding salt/derivative forms, depending on handling) support conversion to protected amino acid derivatives, amide formation, and further functional group interconversions that preserve the aliphatic chain for hydrophobic or spacing effects. As a chiral amino acid precursor class material, DL-2-Aminononanoic acid can be used to construct longer-chain amide, peptide-like, and polymer-linked structures where aliphatic hydrophobicity and amine reactivity are key design elements.

1. Peptide Synthesis

DL-2-Aminononanoic acid is applied in peptide chemistry as a long-chain aliphatic amino acid building block for constructing amide-linked sequences and peptide analogs with enhanced hydrophobic spacing. The α-amino and carboxyl groups enable peptide coupling after conversion to an appropriate protected amino acid form, while the racemic (DL) stereochemistry can be used when stereochemical uniformity is not required or when racemate-to-enantiomer separation is planned downstream. Side-chain length and flexibility can be leveraged to tune conformational preferences in peptide scaffolds and to probe how hydrophobic chain length affects coupling outcomes and secondary structure tendencies. Downstream derivatives include N-protected amino acid residues, peptide fragments for solid-phase or solution-phase assembly, and amide-linked intermediates suitable for further functionalization.

2. Chiral Building Block Development

DL-2-Aminononanoic acid serves as a chiral amino acid intermediate feedstock for developing stereochemically defined analogs through resolution or stereoselective derivatization strategies. The α-stereocenter and the primary amine provide handles for forming diastereomeric salts, carbamate/amide derivatives, or auxiliary-bound intermediates that can be separated to obtain enantiopure material. The unbranched nine-carbon chain remains chemically stable under many protection and deprotection conditions, supporting its use as a consistent hydrophobic fragment in chiral synthesis routes. Resulting downstream products include enantiopure 2-aminononanoate derivatives for asymmetric peptide construction, chiral SAR libraries, and process-ready intermediates for fine chemical synthesis.

3. Polymer And Material Modification

DL-2-Aminononanoic acid is utilized in polymer modification and functional material chemistry where amine-bearing aliphatic monomers or linkers are required to introduce hydrophobic segments and reactive primary amine sites. The free amino functionality can be incorporated into amide-forming reactions with carboxylic acid-containing polymers or crosslinkers, while the carboxyl functionality can be converted to activated esters or coupling partners for grafting onto polymer backbones. The linear C9 chain contributes to controlled hydrophobicity and chain mobility, which can influence film formation, surface properties, and compatibility in composite materials. Downstream utility includes preparation of amino-acid-based monomers, chain-transfer or grafting intermediates, and amine-functional polymer additives for specialty chemical production.

4. Chemical Biology Probes

DL-2-Aminonanoic acid can be applied in chemical biology research as an amino acid component for constructing hydrophobic linkers and amide-linked probe scaffolds used in molecular recognition studies. The α-amino group enables conjugation chemistry after protection or activation, while the carboxyl group supports formation of stable amide bonds to biomolecule-targeting moieties or affinity handles. Racemic composition may be used in early-stage probe design where hydrophobic spacing and linker length dominate binding geometry, with later refinement possible via resolution to a single stereoisomer. Downstream derivatives include labeled or affinity-tagged peptide-like linkers, small-molecule conjugation intermediates, and probe precursors for biochemical assay development.

5. Process Chemistry Intermediate

DL-2-Aminonanoic acid is suitable for process chemistry and industrial intermediate preparation where long-chain amino acid building blocks are required for downstream manufacturing of amide and peptide-like materials. The presence of both an α-amine and a carboxyl group supports scalable conversion into protected amino acid derivatives, activated esters, or coupling-ready intermediates that can be fed into continuous or batch coupling steps. The saturated aliphatic side chain can be carried through multiple transformations with minimal risk of side reactions associated with more reactive functional groups, supporting robust route design. Resulting downstream products include intermediate streams for fine chemical synthesis, specialty amide products, and amino acid-derived components used in industrial chemical manufacturing and applied materials chemistry.

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