H-p-Nitro-D-Phe-OMe · HCl

H-p-Nitro-D-Phe-OMe · HCl is a protected amino acid methyl ester salt derived from D-phenylalanine, featuring a p-nitro substituent on the aromatic ring and an esterified carboxyl group as a methyl ester. The presence of the nitro group introduces a strongly electron-withdrawing functionality that can influence aromatic reactivity and downstream derivatization, while the D stereocenter provides defined chiral control for stereoselective peptide and peptidomimetic construction. The hydrochloride salt form indicates a protonated amine, supporting handling stability and enabling predictable coupling behavior after appropriate base-mediated neutralization. Collectively, this chiral nitro-phenylalanine ester serves as a chemically tractable intermediate for protected amino acid synthesis, aromatic functional group transformation, and peptide building block preparation.

1. Protected Amino Acid Chemistry

H-p-Nitro-D-Phe-OMe · HCl is applied in protected amino acid synthesis workflows where an amine salt and a methyl ester enable controlled peptide coupling chemistry. The D-configuration at the α-carbon provides stereochemical fidelity for incorporation into D-amino acid sequences, while the p-nitro side-chain functionality can be retained through coupling or selectively transformed after peptide assembly. The methyl ester can participate in standard deprotection and activation strategies to access the corresponding carboxylic acid or activated ester forms used for amide bond formation. Downstream, this salt form supports stepwise synthesis of protected amino acid derivatives and peptide building blocks for chiral scaffold construction.

2. Peptide Synthesis

H-p-Nitro-D-Phe-OMe · HCl is suitable for peptide synthesis and solid-phase or solution-phase assembly of D-amino acid-containing peptides. The protonated amine and ester-protected carboxyl group align with common peptide coupling logic, allowing conversion to a carboxylate or activated carboxylic acid equivalent as the sequence is extended. The p-nitro aromatic group can function as a stable handle during chain elongation, supporting later aromatic reduction, nitration-state manipulation, or electrophile-directed transformations depending on the synthetic plan. Incorporation of this chiral nitro-phenylalanine into peptide analogs supports structure-activity relationship studies and D-residue incorporation strategies in peptide science.

3. Peptidomimetic And SAR Studies

H-p-Nitro-D-Phe-OMe · HCl is employed in peptidomimetic and SAR studies where aromatic nitro substitution and D-amino acid stereochemistry help tune binding-site interactions. The phenylalanine backbone provides a hydrophobic aromatic motif, while the nitro group introduces polarity and electron-withdrawing character that can affect conformational preferences and intermolecular interactions in peptide analogs. Ester-to-acid conversion and subsequent derivatization enable access to amide, urea, or other carboxyl-derived linkages that support systematic library generation. Downstream, the compound can be used to construct analog series for SAR-driven optimization of peptide-like molecules and chiral molecular scaffolds.

4. Side-Chain Functionalization

H-p-Nitro-D-Phe-OMe · HCl is applied for side-chain functionalization strategies leveraging the p-nitro aromatic group as a reactive transformation site. The nitro substituent can be carried through early synthesis steps and later converted into alternative functional groups, enabling access to amino, hydroxylamine, or other nitro-derived motifs that modulate polarity and reactivity. The methyl ester and amine salt provide orthogonal functional group management, allowing selective deprotection or activation without disturbing the aromatic substituent until the desired stage. Resulting derivatives can serve as intermediates for further conjugation chemistry, aromatic substitution chemistry, or fine chemical synthesis routes that require a chiral nitro-phenylalanine precursor.

5. Analytical Standards And Labeling

H-p-Nitro-D-Phe-OMe · HCl is suitable for analytical research and method development where a defined D-amino acid methyl ester with a nitro-tagged aromatic ring supports LC-MS and derivatization-based quantification. The fixed stereochemistry and distinct nitro functionality provide a characteristic chemical signature that can improve detection selectivity for amino acid derivative profiling. Ester and amine salt features can be used to generate reference materials corresponding to specific protection states encountered during peptide synthesis and amino acid derivatization studies. Downstream, the compound can support calibration standard preparation and comparative analysis of protected amino acid intermediates, including stereochemical and functional group state verification in synthetic chemistry workflows.

6. Pharmaceutical Intermediate Preparation

H-p-Nitro-D-Phe-OMe · HCl is relevant to pharmaceutical intermediate preparation and process chemistry intermediate design where chiral nitro-phenylalanine derivatives are used as feedstocks for peptide-like and peptidomimetic fragments. The protected amine hydrochloride form and methyl ester enable controlled handling and can be integrated into manufacturing routes that require stepwise conversion between ester and acid states for subsequent coupling or fragment assembly. The p-nitro aromatic group provides a chemically addressable handle that can be transformed into alternative substituents during downstream intermediate elaboration while maintaining the D stereocenter. Broader relevance includes fine chemical synthesis of chiral building blocks for industrial-scale peptide construction and structured intermediate generation for applied synthetic programs.

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