L-Phenylalanine is a naturally occurring proteinogenic amino acid with an α-amino and α-carboxyl functional group and a benzyl side chain that is hydrophobic and aromatic. The molecule bears the amino group and carboxyl group in their free (unprotected) forms and is specified as the L stereoisomer, which corresponds to the stereochemistry commonly used for incorporation into peptides. L-Phenylalanine is used as a defined building block for peptide synthesis and for preparing amino acid-containing standards and substrates in analytical and biochemical studies where aromatic side-chain composition is relevant.
CAT No: CP01602
CAS No:63-91-2
Synonyms/Alias:N-methyl-D-asparticacid;NMDA;6384-92-5;N-Methyl-D-aspartate;N-Methylaspartate;NmethylDaspartate;N-Methylasparticacid;N-Me-D-Asp-OH;(R)-2-(Methylamino)succinicacid;(2R)-2-(methylamino)butanedioicacid;D-Asparticacid,N-methyl-;CHEMBL291278;CHEBI:31882;n-methyl-d-asparticacid(nmda);HOKKHZGPKSLGJE-GSVOUGTGSA-N;N-Methyl-D-asparticAcid,Hydrate;BRN1724431;Asparticacid,N-methyl-;SMR000326806;2-Methylamino-succinicacid;n-methyl-
L-Phenylalanine is the L-enantiomer of the essential amino acid bearing a benzyl side chain, giving a chiral α-carbon with a primary amino group and a carboxylic acid functionality. The molecule's zwitterionic character in aqueous media and its aromatic phenyl ring enable both standard amino acid coupling chemistry and side-chain-directed derivatization. L-Phenylalanine participates in peptide bond formation through its amino and carboxyl groups, and it can be converted into protected amino acid derivatives to control chemoselectivity during multistep synthesis. The aromatic side chain also supports downstream transformations such as electrophilic aromatic substitution, side-chain oxidation to phenylacetyl derivatives, and incorporation into non-natural analogs for structure-activity relationship and molecular recognition studies.
1. Peptide Synthesis
L-Phenylalanine is used in peptide building workflows where its α-amino and α-carboxyl groups enable amide bond formation to generate Phe-containing sequences. The benzyl side chain provides a stable hydrophobic/aromatic element that can be retained for native peptide analogs or modified after coupling to introduce tailored steric and electronic effects. N- and C-terminal protection strategies, such as converting the amino group and carboxyl group into orthogonally removable forms, support sequential peptide assembly and minimize side reactions. L-Phenylalanine-derived peptide fragments can serve as research-grade intermediates for library synthesis, peptide mapping, and scaffold diversification in peptide science and peptidomimetic construction.
2. Chiral Amino Acid Derivatization
L-Phenylalanine is applied as a chiral amino acid precursor for stereodefined synthesis of functionalized benzyl-bearing derivatives and chiral intermediates. The intact stereocenter at the α-carbon allows retention of L-configuration through derivatization steps that target the side-chain phenyl ring or the amino/carboxyl functionalities via temporary protection. Side-chain functionalization routes can generate aryl-substituted phenylalanine analogs, while conversion to protected amino acid esters or amides enables controlled downstream transformations. L-Phenylalanine therefore functions as a practical starting point for chiral synthesis programs that require consistent stereochemical identity across multistep fine chemical production.
3. Chemical Biology And Protein Engineering
L-Phenylalanine is utilized in chemical biology and protein engineering contexts where aromatic side chains participate in molecular recognition, hydrophobic packing, and binding-site interactions. The amino acid's functional groups support incorporation into recombinant protein constructs through standard amino acid chemistry or through derivatization strategies that enable controlled labeling and subsequent conjugation. Protected forms can be used to introduce reactive handles at the amino terminus or carboxyl terminus for bioconjugation workflows, including attachment of probes, affinity tags, or cleavable linkers. L-Phenylalanine-containing peptide and protein fragments can be employed to probe structure-function relationships, validate binding motifs, and support mechanistic studies of biomolecular interactions.
4. Bioconjugation Chemistry
L-Phenylalanine is suitable for bioconjugation chemistry because its amino acid backbone can be converted into N-protected or activated derivatives that participate in coupling to biomolecular targets. The benzyl side chain can be retained to maintain hydrophobic character while the α-functional groups can be engineered into conjugation-ready intermediates for amide formation, linker installation, or controlled deprotection. Protection-group strategies enable orthogonal reactivity, allowing selective attachment at one terminus while preserving the other for subsequent coupling steps. L-Phenylalanine-derived conjugates can be used as intermediates for labeled peptides, affinity reagents, and analytical standards that support downstream detection and characterization workflows.
5. Pharmaceutical And Fine Chemical Manufacturing
L-Phenylalanine is employed in industrial chemical manufacturing as a chiral feedstock for producing protected amino acid intermediates and downstream synthetic building blocks. The amino acid's well-defined functional group set enables conversion to protected amino acid esters, activated amides, and peptide coupling reagents that integrate into process chemistry routes for peptide-related intermediates. The aromatic side chain contributes consistent physicochemical behavior in intermediate purification and can be carried through manufacturing sequences where Phe-containing fragments are required. L-Phenylalanine therefore serves as a practical starting material for specialty chemical production, including the preparation of amino acid derivatives used in peptide manufacturing supply chains and fine chemical synthesis.
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