H-p-Fluoro-DL-Phe-OMe · HCl

H-p-Fluoro-DL-Phe-OMe · HCl is a hydrochloride salt of a methyl esterified phenylalanine derivative bearing a para-fluoro substituent on the aromatic ring. The molecule contains a chiral, amino acid-derived stereocenter in the DL (racemic) configuration, paired with a protected/activated carboxyl functionality as an O-methyl ester that can participate in peptide coupling after conversion to an appropriate acid or activated derivative. The aromatic para-fluorine provides a defined electronic and steric handle for medicinal chemistry-style diversification, while the anilide-forming amino group is present as an HCl salt, which supports controlled handling and subsequent protection or coupling chemistry. The presence of both an amino functionality and a fluorinated phenyl ring makes the compound a practical chiral amino acid intermediate for downstream derivatization, peptide building block preparation, and analytical or SAR-oriented synthesis.

1. Peptide Synthesis

H-p-Fluoro-DL-Phe-OMe · HCl is applied in peptide coupling workflows where phenylalanine-like side-chain structure is required, and the para-fluoro aromatic substituent enables incorporation of fluorinated residues into peptide sequences. The amino acid ester form supports ester-stable handling during N-protection and coupling setup, while the HCl salt can be managed for conversion to an N-protected amino acid derivative suitable for amide bond formation. Conversion of the O-methyl ester to a carboxylate-equivalent (for example, via hydrolysis to the acid followed by activation) can align the building block with standard peptide coupling strategies. The resulting fluorinated peptide intermediates can be used to generate peptide analogs for structure-activity relationship studies and for mapping how aromatic fluorination influences conformational preferences and binding interactions.

2. Chiral Building Block Development

H-p-Fluoro-DL-Phe-OMe · HCl serves as a chiral amino acid intermediate for accessing fluorinated phenylalanine derivatives in synthetic organic chemistry, with the DL stereochemical mixture enabling rapid entry into stereochemically defined libraries after resolution or stereoselective downstream transformations. The para-fluoro substituent provides a stable, non-exchangeable functional group that can be retained through protection/deprotection cycles and can withstand many peptide-manufacturing conditions. The amino acid ester and salt form facilitate controlled derivatization into N-protected forms and subsequent conversion to acid or activated intermediates for stereochemical refinement. Downstream use includes preparing enantiopure fluorinated analogs, generating chiral scaffolds for medicinal chemistry research, and supplying defined stereochemical inputs for SAR studies and peptidomimetic construction.

3. Side-Chain Functionalization

H-p-Fluoro-DL-Phe-OMe · HCl is used in side-chain functionalization and aromatic diversification strategies where the para-fluorine acts as a handle for electronic tuning and for creating fluorinated analogs of phenylalanine-based motifs. The fluorinated aromatic ring can be carried through N-protection and ester-to-acid conversion steps, enabling late-stage modifications of the amino acid framework while maintaining the fluorine's positional identity. The amino group can be transformed into amide, urea, or other nitrogen-containing derivatives, supporting downstream formation of conjugatable intermediates and peptide-like scaffolds. The resulting fluorinated amino acid derivatives can be employed to generate molecular probes, SAR-focused analog series, and intermediate platforms for constructing peptidomimetics with defined aromatic substitution patterns.

4. Chemical Biology And Labeling

H-p-Fluoro-DL-Phe-OMe · HCl is relevant to chemical biology workflows that require fluorinated aromatic residues for probe design, binding studies, or tracer synthesis where a para-fluoro phenylalanine motif provides a distinct spectroscopic and interaction profile. The amino acid backbone enables incorporation into peptide conjugates through standard amide-forming chemistry after appropriate N-protection and carboxyl activation, while the fluorine can contribute to differentiation in analytical readouts and can be retained as a stable tag. The ester and HCl salt form support stepwise synthesis of labeled intermediates, including conversion into coupling-ready building blocks and subsequent attachment to biomolecule scaffolds. Downstream applications include preparing fluorinated peptide conjugates for biochemical research, generating molecular recognition reagents, and supporting analytical method development for fluorinated biomolecular fragments.

5. Pharmaceutical Intermediate Preparation

H-p-Fluoro-DL-Phe-OMe · HCl is suitable for pharmaceutical intermediate preparation in fine chemical synthesis where fluorinated amino acid derivatives are used to build structure-defined fragments for medicinal chemistry and process chemistry routes. The compound's amino acid functionality supports conversion into N-protected derivatives and activated carboxyl forms, aligning with manufacturing-oriented synthesis of peptide-like intermediates and chiral building blocks. The para-fluoro aromatic group provides a chemically robust substituent that can be carried through multi-step sequences and incorporated into larger molecules without requiring exchangeable functional groups. Downstream utility includes producing fluorinated amino acid intermediates for peptidomimetic construction, preparing defined substitution patterns for SAR studies, and supplying consistent inputs for scalable synthesis of complex nitrogen-containing fluorinated products.

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