H-D-Phg-OMe*HCl

H-D-Phg-OMe*HCl is a D-configuration phenylglycine methyl ester hydrochloride, presenting a chiral α-amino acid motif in which the amino group is acylated as an N-protected amide (H-D-Phg-OMe*HCl notation) and the carboxyl functionality is masked as a methyl ester. The hydrochloride salt form improves handling and defines the protonation state of the amino functionality during peptide-coupling planning, while the phenyl side chain provides aromatic hydrophobic character that can influence conformational preferences in peptide analogs and binding studies. The D stereocenter enables stereochemically defined incorporation of a non-natural amino acid element into peptide building blocks, supporting chiral control in synthetic sequences. The combination of ester and N-protection pattern supports downstream transformations such as ester hydrolysis to a carboxylic acid, conversion to activated derivatives for coupling, and preparation of stereochemically stable peptidomimetic scaffolds.

1. Peptide Synthesis

H-D-Phg-OMe*HCl is applied in peptide building block preparation and stepwise peptide coupling workflows where a D-phenylglycine residue is required. The methyl ester and N-protected amino functionality align with standard peptide assembly strategies that rely on orthogonal reactivity between the carboxyl equivalent and the amine nucleophile. The D stereochemistry supports incorporation of a stereodefined unnatural amino acid unit that can modulate backbone conformation and proteolytic stability in peptide analogs. The hydrochloride salt form can be leveraged to manage amine protonation during coupling planning, enabling consistent formation of amide linkages. Downstream processing can include ester deprotection or hydrolysis to generate a carboxyl-activated intermediate for further chain elongation.

2. Peptidomimetics And SAR

H-D-Phg-OMe*HCl is used in peptidomimetic construction and structure-activity relationship studies that require aromatic, chiral amino acid elements to probe binding-site geometry. The phenylglycine side chain and D configuration provide a stereochemically constrained residue that can be incorporated into analog libraries to examine how changes in stereochemistry and hydrophobic surface presentation affect molecular recognition. The protected amino acid ester format supports sequential functional group manipulations, including conversion to carboxylic acid for amide formation or transformation into coupling-ready derivatives. The resulting D-phenylglycine-containing motifs can be assembled into short peptide mimics, constrained scaffolds, or backbone-modified constructs for SAR mapping. Amino acid derivatization strategies based on this chiral intermediate can be extended to generate multiple analogs while maintaining a consistent stereochemical core.

3. Chiral Building Blocks

H-D-Phg-OMe*HCl serves as a chiral amino acid intermediate for stereoselective synthesis routes that need D-configuration control at the α-carbon. The presence of a single defined stereocenter and the aromatic phenyl side chain supports its use as a fragment in asymmetric or stereochemical diversification programs, including the preparation of D-amino acid derivatives with tailored side-chain or terminal functionality. The ester and N-protection pattern enable staged deprotection and activation sequences, allowing chemists to generate either carboxylate equivalents for coupling or free acid forms for further derivatization. The hydrochloride salt provides a practical handle for handling and can influence salt formation equilibria relevant to downstream transformations. This makes the compound suitable for chiral synthesis planning in fine chemical production where stereochemical fidelity is required across multiple synthetic steps.

4. Chemical Manufacturing Intermediates

H-D-Phg-OMe*HCl is suitable for industrial chemical manufacturing as a process intermediate in the production of D-phenylglycine-containing building blocks and peptide-like intermediates. The methyl ester provides a controlled carboxyl equivalent that can be converted to activated carboxylic acid forms under process conditions, supporting scalable peptide coupling chemistry. The N-protected amino acid framework and stable stereocenter support reproducible intermediate generation for downstream assembly of amide-containing products. Hydrochloride salt formation can be used to standardize material handling characteristics and define protonation state during batch processing and purification planning. The resulting downstream derivatives, including acid forms and coupling-ready intermediates, can feed into specialty chemical production programs that manufacture chiral amino acid derivatives and peptidomimetic fragments.

5. Analytical Standards for Peptide Chemistry

H-D-Phg-OMe*HCl can be employed as a reference material in analytical research for peptide chemistry workflows that distinguish D-phenylglycine-containing species. The defined structure, including the D stereocenter, aromatic side chain, methyl ester functionality, and salt form, supports unambiguous identification and method development for LC-MS or chiral chromatographic analyses of peptide intermediates and analogs. The protected amino acid ester format can help generate consistent analytical signals for monitoring ester-to-acid conversions, coupling outcomes, and impurity profiles tied to stereochemical identity. The compound's structural clarity makes it useful for calibrating detection methods for amino acid derivatives and for validating analytical separation of stereoisomeric peptide components. Broader use in amino acid chemistry includes supporting quality-by-design documentation for chiral intermediate characterization in applied peptide synthesis programs.

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