H-p-Fluoro-Phe-OEt · HCl

H-p-Fluoro-Phe-OEt · HCl is a hydrochloride salt of an ethyl ester protected phenylalanine derivative bearing a para-fluorine substituent on the aromatic ring. The molecule combines an amino acid ester motif with a stereogenic center at the α-carbon (retained from the parent phenylalanine configuration) and an electron-withdrawing aryl fluorine that modulates aromatic reactivity and downstream cross-coupling behavior. The HCl salt form increases the handling stability of the amino functionality and supports controlled coupling chemistry under peptide synthesis conditions. The ester functionality enables conversion to amide linkages during peptide construction and can be transformed into alternative carbonyl derivatives for synthetic intermediate preparation.

1. Peptide Synthesis

H-p-Fluoro-Phe-OEt · HCl is employed in peptide building block preparation where the ethyl ester participates in amide bond formation and the α-amino group supports standard coupling strategies after appropriate activation. The para-fluoro substituted phenyl side chain functions as a stable aromatic handle for later derivatization while remaining compatible with common peptide coupling conditions. The hydrochloride salt form can facilitate reproducible amino protection/deprotection workflows when converting the amino ester into N-protected amino acid intermediates for sequential chain assembly. Downstream, the resulting fluorinated peptide fragments can be incorporated into peptide libraries and fragment-based scaffolds used for structure-activity relationship studies and peptide analog construction.

2. Chiral Amino Acid Intermediate

H-p-Fluoro-Phe-OEt · HCl serves as a chiral amino acid intermediate for stereodefined synthesis of fluorinated aromatic derivatives and protected amino acid chemistry. The defined α-stereocenter and the amino acid ester framework allow conversion into N-protected derivatives or alternative C-terminal formats while maintaining stereochemical integrity during functional group interconversions. The para-fluorine substituent provides a chemically distinct aryl environment that can be carried through multistep routes and later used to tune polarity and reactivity in medicinal chemistry-like workflows. The compound can be applied to the preparation of chiral intermediates for fine chemical synthesis and synthetic organic chemistry programs requiring a fluorinated phenylalanine scaffold.

3. Side-Chain Functionalization

H-p-Fluoro-Phe-OEt · HCl is suitable for side-chain functionalization and aromatic substitution planning because the para-fluorine can act as a leaving group equivalent in nucleophilic aromatic substitution or as a coupling partner in transition-metal mediated aryl functionalization. The phenylalanine-derived side chain provides a rigid hydrophobic/aromatic region for incorporation into modified amino acid derivatives and peptidomimetic structures. The ester carbonyl can be retained for subsequent transformations into activated acids, amides, or other carbonyl-bearing intermediates that connect side-chain modification with peptide-ready formats. Downstream use includes generating fluorinated analogs for SAR studies, molecular design campaigns, and chemical biology probes where controlled aryl substitution patterns are required.

4. Pharmaceutical Intermediate Preparation

H-p-Fluoro-Phe-OEt · HCl can be used as a process chemistry intermediate in the manufacture of fluorinated amino acid derivatives and peptide-like intermediates for pharmaceutical synthesis routes. The amino ester and hydrochloride salt form support practical conversion into protected amino acid building blocks that can be fed into peptide coupling sequences or into fragment assembly steps. The fluorinated aromatic ring can be carried as a stable motif through protecting-group strategies, enabling late-stage diversification of aryl substitution patterns in downstream steps. The compound's structural features align with industrial fine chemical synthesis needs for chiral, fluorinated building blocks that integrate into larger synthetic supply chains.

5. Analytical Standards And Labeling

H-p-Fluoro-Phe-OEt · HCl is applicable to analytical research as a reference material for method development involving fluorinated amino acid esters and peptide fragments. The combination of a defined stereocenter, a para-fluoro aromatic tag, and an amino acid ester motif enables chromatographic and spectrometric discrimination from non-fluorinated analogs during LC-MS, NMR, and derivatization-based assays. The hydrochloride salt form can improve reproducibility of sample preparation when comparing ester-to-amide conversion products or monitoring peptide coupling endpoints. Downstream, the compound can support quantitative or qualitative workflows for tracking fluorinated intermediates in peptide synthesis development and for verifying structural integrity of amino acid derivative series used in biochemical research.

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