H-D-2Nal-OH

H-D-2Nal-OH is a chiral amino acid derivative in which the side chain is a 2-naphthyl group bearing a stereogenic center at the alpha carbon, presented as the free acid with an N-terminal hydrogen (H-). The molecule contains a primary carboxylic acid functionality that supports salt formation and peptide-coupling chemistry, while the naphthyl aromatic system provides strong hydrophobic and π-interaction character for molecular recognition and scaffold probing. The D-configuration at the alpha stereocenter governs stereoselective outcomes in downstream coupling, racemization-sensitive transformations, and chiral SAR workflows. The absence of N-protection means the compound can be used directly as a stereodefined building block, while also serving as a reference point for evaluating protecting-group strategies in protected amino acid synthesis.

1. Peptide Synthesis

H-D-2Nal-OH is applied in peptide synthesis workflows where a stereodefined, aromatic side-chain residue is incorporated as a D-configured building block. The free carboxylic acid participates in standard peptide coupling chemistry, enabling formation of amide bonds to N-protected amino acids or activated peptide fragments, while the unprotected N-terminus can be managed by selective protection when orthogonality is required. The 2-naphthyl side chain supports incorporation into peptide backbones that probe hydrophobic packing, folding propensity, and aromatic stacking effects. Downstream, the resulting D-2Nal-containing peptides can be used as research-grade constructs for method development, structure-activity relationship studies, and stereochemical consistency checks across synthetic libraries.

2. Peptidomimetics And SAR

H-D-2Nal-OH is used in peptidomimetic and SAR studies to introduce a rigid, π-rich naphthyl motif with defined stereochemistry at the alpha carbon. The D-amino acid configuration enables stereochemical tuning of conformational preferences and binding-site complementarity when incorporated into constrained analogs or fragment-based scaffolds. The carboxylic acid functionality allows conversion into activated intermediates or attachment handles for building analog series, while the aromatic side chain supports measurable changes in lipophilicity and aromatic interaction patterns. The compound can therefore serve as a chiral intermediate for generating stereochemically consistent libraries that support SAR mapping and structure-guided optimization in medicinal chemistry programs.

3. Chemical Biology Probes

H-D-2Nal-OH is suitable for chemical biology research where aromatic amino acid analogs function as recognition elements, labeling handles, or hydrophobic anchors in probe design. The 2-naphthyl group can participate in fluorescence-compatible or hydrophobic interaction-driven behaviors when conjugated into larger biomolecule-reactive constructs, while the alpha-carboxyl group enables controlled derivatization for linker installation. The D-configuration helps maintain stereochemical fidelity in biosynthetic mimicry and can be used to evaluate stereospecific binding or processing by enzymes and binding proteins. Downstream applications include preparation of biomolecule-modified probes and chiral reference standards that support mechanistic studies and interaction mapping.

4. Chiral Amino Acid Intermediate

H-D-2Nal-OH is employed as a chiral amino acid intermediate for protected amino acid synthesis and stereodefined derivative preparation. The free acid group supports conversion into activated esters or coupling-ready forms, while the D-stereocenter can be carried through protection, activation, and selective functional group transformations with attention to racemization control. The unprotected N-H functionality can be protected to enable orthogonal peptide assembly, or converted into N-substituted derivatives for downstream conjugation chemistry. The resulting protected or functionalized derivatives can feed into fine chemical synthesis routes that require a D-configured naphthyl amino acid building block with reliable stereochemical identity.

5. Analytical Standards

H-D-2Nal-OH is used in analytical research as a stereochemically defined reference material for method validation and chiral separation studies involving amino acid derivatives. The combination of a carboxylic acid and a strongly aromatic naphthyl side chain supports robust detection by common chromatographic and spectroscopic techniques, and the D-configuration enables unambiguous assignment of stereoisomeric peaks. Derivatization of the carboxyl group or N-functionalization can be applied to generate standards for LC-MS quantitation, chiral HPLC calibration, and impurity profiling in amino acid derivative manufacturing. The compound thereby functions as a practical analytical anchor for monitoring stereochemical integrity and chemical identity during synthetic and process development.

6. Pharmaceutical Intermediate Preparation

H-D-2Nal-OH is applicable to pharmaceutical intermediate preparation where D-configured aromatic amino acid fragments are incorporated into small-molecule scaffolds and peptidomimetic candidates. The carboxylic acid enables formation of activated intermediates for amide coupling, while the naphthyl side chain can be carried into later stages to tune binding-site hydrophobicity and aromatic interaction patterns. The free N-H can be protected to match manufacturing route requirements for orthogonal chemistry, supporting controlled sequence assembly in multistep synthesis. Downstream, D-2Nal-containing intermediates can be used to generate stereochemically consistent analog series for process chemistry development and fine chemical synthesis targeting amino acid-derived motifs.

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