L-HomoPhenylalanine ethylester hydrochloride

L-HomoPhenylalanine ethylester hydrochloride is an ethyl ester hydrochloride salt of the L-configured amino acid, featuring a chiral α-carbon bearing an amino group and a extended side chain that terminates in a phenyl ring. The hydrochloride form protonates the amino functionality, improving handling of the amino ester while keeping the compound compatible with standard amino acid derivatization workflows. The ester and amino groups provide orthogonal reactivity for peptide coupling chemistry and for downstream conversion into amides, protected amino acid derivatives, or side-chain functionalized intermediates. The additional methylene unit relative to phenylalanine can influence conformational preferences in peptide scaffolds and can serve as a stereochemically defined chiral building block for synthetic and biochemical studies.

1. Peptide Synthesis

L-HomoPhenylalanine ethylester hydrochloride serves as an L-configured amino acid ester input for peptide building block preparation in solid-phase or solution-phase workflows. The combination of a protected or activatable amino functionality (as the hydrochloride salt) and a carboxylate equivalent (the ethyl ester) supports conversion into coupling-ready derivatives through established amino acid activation and amide bond formation strategies. The side-chain phenyl group participates in hydrophobic interactions within peptide sequences and can be used to probe how extended aromatic spacing affects folding and binding motifs. Downstream, incorporation into peptide analogs enables systematic evaluation of sequence effects and provides a practical route to homo-phenylalanine-containing peptides and peptidomimetics.

2. Chiral Amino Acid Intermediate

L-HomoPhenylalanine ethylester hydrochloride functions as a chiral amino acid intermediate for stereodefined synthesis of substituted aromatic amino acid derivatives. The L-stereocenter is preserved through ester-based transformations, enabling preparation of N-protected homo-phenylalanine derivatives for controlled peptide coupling and for selective side-chain chemistry. The ethyl ester can be hydrolyzed or exchanged to other carboxylate equivalents to match specific coupling chemistries, while the amino group can be temporarily masked using protection-group strategies compatible with peptide synthesis. The resulting intermediates can feed into chiral library construction, fragment elaboration, and stereochemical studies where maintaining the L-configuration is required.

3. Side-Chain Functionalization

L-HomoPhenylalanine ethylester hydrochloride is suitable for side-chain functionalization routes that leverage the terminal phenyl ring and the ester-to-amide conversion handle. The extended aromatic side chain can undergo electrophilic aromatic substitution, cross-coupling, or oxidation-state adjustments after appropriate protection of the amino functionality to prevent undesired reactions. The ester group provides a controllable functional group for sequential chemistry, allowing carboxyl activation after side-chain modification to generate amide-linked products or to install additional substituents for SAR-oriented scaffold diversification. Downstream products can include functionalized homo-phenylalanine residues used in peptidomimetic construction, receptor-binding motif optimization, and chemical biology probes requiring aromatic spacing control.

4. Chemical Manufacturing Intermediates

L-HomoPhenylalanine ethylester hydrochloride can be applied in industrial fine chemical synthesis as a process-friendly chiral feedstock for manufacturing peptide intermediates and amino acid derivative streams. The hydrochloride salt form improves handling characteristics for amino ester processing and can support consistent downstream conversion into N-protected amino acid derivatives and activated carboxyl equivalents used in controlled coupling steps. The ethyl ester provides a practical carboxylate equivalent for batch processing, enabling conversion to carboxylic acids or activated esters under conditions tailored to manufacturing constraints. The compound's defined L-configuration and aromatic side chain make it a relevant intermediate for producing homo-phenylalanine-containing building blocks used across peptide manufacturing, specialty chemical production, and industrial-scale synthesis of chiral amide frameworks.

5. Analytical Standards And Labeling

L-HomoPhenylalanine ethylester hydrochloride is applicable to analytical research workflows that require a defined amino acid reference material for method development and characterization. The ester hydrochloride form provides a consistent chemical identity for chromatographic and mass spectrometric evaluation of amino acid derivatives, including monitoring of ester hydrolysis, N-protection states, and conversion to amide products. The phenyl-bearing side chain and the stereochemically defined α-carbon can be exploited when preparing standards for peptide hydrolysate analysis, amino acid profiling, or impurity tracking during protected amino acid synthesis. Downstream, isotopically labeled or derivatized analogs derived from this intermediate can support quantitative studies of peptide coupling outcomes and the verification of homo-phenylalanine incorporation in complex mixtures.

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