H-p-Chloro-D-Phe-OMe · HCl

H-p-Chloro-D-Phe-OMe · HCl is a hydrochloride salt of the methyl ester of D-phenylalanine bearing a para-chloro substituent on the aromatic ring. The molecule combines an amino functionality (present as a protonated amine under salt conditions) with a protected carboxyl group as a methyl ester, while the chiral D-configuration at the α-carbon provides stereochemical control for downstream peptide coupling and stereodefined analog synthesis. The para-chloro aryl substituent introduces a handle for electrophilic aromatic substitution, cross-coupling, and halogen-directed derivatization, enabling systematic structure modification in peptide and peptidomimetic scaffolds. The salt form improves handling and can support reproducible coupling chemistry where the amino group is required in protected-amino-acid-like formats, while the ester group can be selectively transformed into amides, acids, or activated derivatives for further synthetic steps.

1. Peptide Synthesis

H-p-Chloro-D-Phe-OMe · HCl supports peptide building workflows where a stereodefined D-phenylalanine residue is required, and the para-chloro phenyl ring can be retained as a stable aromatic motif during coupling. The amino functionality in the hydrochloride form can be managed to enable amide bond formation after appropriate base treatment, while the methyl ester provides a defined C-terminal protection state that can be converted to an acid or activated intermediate when needed. D-configuration at the α-carbon supports incorporation into peptide sequences for stereochemical studies, including D-amino-acid enriched analogs that alter conformational preferences and proteolytic stability. The resulting peptide fragments and longer constructs can be used as research-grade intermediates for peptide library generation and sequence-specific structure-function investigations in amino acid chemistry.

2. Peptidomimetics And SAR

H-p-Chloro-D-Phe-OMe · HCl is suitable for peptidomimetic and SAR-oriented synthesis because the para-chloro substituent provides a chemically addressable aromatic element for medicinal chemistry-style diversification. The compound's D-phenylalanine backbone enables stereochemically consistent incorporation into constrained analogs, while the methyl ester can be carried through as a C-terminal functional handle or converted to amide/acid forms to match target scaffold requirements. Halogen substitution on the aromatic ring can be leveraged in downstream cross-coupling or selective functional group interconversions, supporting systematic exploration of electronic and steric effects on binding motifs. The amino acid ester format also aligns with fragment assembly strategies used to generate focused libraries of D-amino-acid-containing analogs for structure-activity relationship studies and molecular design.

3. Side-Chain Functionalization

H-p-Chloro-D-Phe-OMe · HCl can be employed in side-chain functionalization routes where the para-chloro aryl group serves as a reactive electrophile for C-C and C-heteroatom bond formation. The aromatic chloride can participate in palladium-catalyzed cross-coupling or other halogen-displacement strategies to install substituents that tune hydrophobicity, polarity, and aromatic interaction patterns in peptide analogs. The preserved D-amino acid stereocenter allows functionalization without scrambling stereochemistry at the α-carbon, supporting the preparation of stereochemically uniform intermediates for subsequent peptide coupling. The methyl ester and amine functionality together enable a controlled sequence of derivatization steps, generating downstream amino acid derivatives that can be carried into protected amino acid synthesis, C-terminal modification, and scaffold elaboration.

4. Protected Amino Acid Intermediate

H-p-Chloro-D-Phe-OMe · HCl functions as a chiral amino acid ester intermediate for protected-amino-acid synthesis planning, where the methyl ester acts as a C-terminal protecting group state and the hydrochloride salt provides a defined amine form for handling. The combination of an α-amino group and a carboxyl ester supports conversion into activated coupling partners or amide derivatives under standard peptide chemistry conditions, enabling stepwise construction of peptide building blocks. The para-chloro aromatic substituent remains intact under many amide-forming transformations, allowing the intermediate to serve as a consistent stereodefined residue during iterative synthesis. Downstream utility includes preparation of D-phenylalanine-containing fragments for peptide coupling chemistry, combinatorial synthesis, and manufacturing-relevant intermediate generation for fine chemical production.

5. Chemical Manufacturing Intermediates

H-p-Chloro-D-Phe-OMe · HCl is applicable to process chemistry contexts where a defined chiral amino acid derivative is needed as a feedstock for controlled downstream transformations in specialty chemical production. The hydrochloride salt form can support reproducible solid handling and can be integrated into manufacturing routes that require consistent amine availability for conversion to amide or activated ester intermediates. The methyl ester provides a stable, isolable C-terminal functionality that can be hydrolyzed or transesterified as part of a larger synthetic sequence, while the para-chloro aryl group offers a predictable site for later diversification steps. The stereochemical integrity of the D-phenylalanine unit supports production of stereodefined intermediates used in peptide analog manufacture, chemical library preparation, and applied amino acid derivatization workflows.

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