H-D-Ser(tBu)-OMe*HCl

H-D-Ser(tBu)-OMe*HCl is a protected D-serine derivative presented as the hydrochloride salt, featuring an N-terminal hydrogen (H-D-Ser) and a side-chain hydroxymethyl group characteristic of serine chemistry. The serine side chain is retained as a free alcohol, while the carboxyl functionality is masked as a methyl ester (OMe) that can participate in ester-based intermediate transformations. The presence of the tBu group on the serine oxygen indicates an O-protection strategy that improves compatibility with peptide coupling conditions by reducing undesired hydroxyl reactivity. The D-stereocenter and salt form influence solubility and stereochemically defined incorporation into peptide building blocks, supporting downstream conversion into amide-linked structures and other functionalized amino acid derivatives.

1. Protected Amino Acid Chemistry

H-D-Ser(tBu)-OMe*HCl serves as a chiral, protected amino acid intermediate for protected amino acid synthesis and derivatization workflows. The methyl ester (OMe) enables controlled conversion between ester and acid/amide forms, while the tBu-protected serine oxygen modulates side-chain nucleophilicity during coupling and functional group interconversions. The D-configuration provides stereochemical definition for preparing D-serine-containing analogs and for constructing stereodivergent libraries where inversion or retention of configuration is a key variable. The hydrochloride salt form can facilitate handling and coupling-relevant activation steps, supporting preparation of downstream amide derivatives and nonpeptidic serine-derived scaffolds used in fine chemical synthesis.

2. Peptide Synthesis

H-D-Ser(tBu)-OMe*HCl is suitable for peptide building block preparation where D-serine incorporation and side-chain protection are required to maintain chemoselectivity. The protected amino acid framework contains an amino functionality (N-H) and a carboxyl equivalent (methyl ester) that can be converted into coupling-ready derivatives for amide bond formation. The tBu-protected hydroxyl helps suppress side reactions such as O-acylation or transesterification during peptide coupling, while the free serine backbone stereochemistry supports consistent incorporation of the D-amino acid unit into peptide sequences. Downstream deprotection strategies can reveal the serine hydroxyl for subsequent phosphorylation-mimic design, conjugation handles, or further functionalization in peptide analog construction.

3. Peptidomimetics And SAR Studies

H-D-Ser(tBu)-OMe*HCl supports peptidomimetic construction and structure-activity relationship studies by providing a stereodefined serine-derived fragment with an orthogonally protected side-chain oxygen. The D-stereocenter can be used to tune backbone conformation and protease recognition in peptide analog series, while the methyl ester and protected hydroxyl enable stepwise elaboration into amide-linked fragments or cyclic intermediates. The tBu protection strategy allows controlled unveiling of the hydroxyl for subsequent derivatization into ether, carbonate, or other oxygen-containing substituents that commonly appear in SAR-focused libraries. The resulting D-serine-containing intermediates can be employed to generate analog panels for medicinal chemistry research and for mapping functional group contributions to molecular recognition.

4. Chemical Biology Labeling

H-D-Ser(tBu)-OMe*HCl can be applied in chemical biology research where serine hydroxyl functionality is needed as a functional handle after selective deprotection. The protected hydroxymethyl group and protected ester form can be carried through multi-step synthesis to produce conjugation-ready amino acid derivatives that later expose reactive alcohol sites for attachment to probes or biomolecule scaffolds. D-serine stereochemistry may be leveraged to improve stability against enzymatic processing in labeling constructs, while the hydrochloride salt can aid in reproducible handling during derivatization sequences. Downstream conversion to amide-linked or ester-linked conjugates can support preparation of labeled peptides, affinity reagents, or analytical standards used to interrogate biomolecular interactions.

5. Pharmaceutical Intermediate Preparation

H-D-Ser(tBu)-OMe*HCl is relevant to pharmaceutical intermediate preparation and process chemistry intermediate development due to its protected amino acid architecture and defined stereochemistry. The combination of an ester-protected carboxyl group and an O-protection strategy supports manufacturing-compatible transformations that require chemoselectivity under peptide-coupling-like conditions. The D-configuration provides a controlled stereochemical input for generating D-serine-containing intermediates used in the synthesis of peptide-like drug candidates, peptidomimetics, or process intermediates for downstream elaboration. The salt form can influence crystallization and isolation behavior in industrial settings, enabling robust intermediate handling for specialty chemical production and fine chemical synthesis routes.

6. Analytical Research Standards

H-D-Ser(tBu)-OMe*HCl can be utilized in analytical research for method development and reference standard preparation involving D-serine-derived protected intermediates. The distinct protecting-group pattern (tBu on the serine oxygen and methyl ester on the carboxyl) provides chromatographic and spectroscopic signatures that help verify identity and monitor reaction progress during protected amino acid synthesis and peptide coupling sequences. The hydrochloride salt form supports consistent sample preparation for analytical workflows that require defined ionization behavior and reproducible solubility. Downstream deprotection or conversion to related amides and acids can generate a family of standards that support LC-MS, NMR, and impurity profiling for amino acid derivative manufacturing and peptide science quality control.

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