H-D-allo-Thr-OMe · HCl

H-D-allo-Thr-OMe · HCl is a hydrochloride salt of the methyl ester of D-allo-threonine, featuring a stereogenic β-carbon characteristic of the allo configuration and a side-chain bearing a β-hydroxyl group. The amino functionality is present as a protonated amine under HCl salt conditions, while the carboxyl group is masked as a methyl ester, which modulates polarity and reactivity relative to the free acid. The combination of a protected/controlled amine state and an esterified C-terminus supports peptide coupling workflows after appropriate base-mediated salt neutralization and ester activation. The β-hydroxyl group can participate in derivatization or be protected during peptide assembly to maintain chemoselectivity and stereochemical integrity of the chiral center.

1. Protected Amino Acid Synthesis

H-D-allo-Thr-OMe · HCl is applied in protected amino acid chemistry as a chiral amino acid ester intermediate where the methyl ester serves as a C-terminal handle for subsequent activation and coupling. The D-allo stereochemistry and the β-hydroxyl functionality enable selective protection strategies, such as hydroxyl protection prior to amide bond formation, to prevent side reactions during peptide synthesis. The HCl salt form supports controlled handling of the amine and can be neutralized to generate the nucleophilic amino component for standard peptide coupling chemistries. Downstream, the compound can be converted into N-protected D-allo-threonine derivatives used for building peptide fragments with defined stereochemical outcomes.

2. Peptide Synthesis

H-D-allo-Thr-OMe · HCl is suitable for peptide synthesis workflows requiring an allo-threonine residue with a defined stereocenter and a reactive side-chain hydroxyl. The amino ester architecture supports transformation into an activated amino component compatible with peptide coupling, while the β-hydroxyl group can be protected or selectively deprotected to align with orthogonal protecting-group schemes. Salt formation with HCl helps stabilize the amine during intermediate isolation, supporting reproducible downstream conversion to N-protected forms and peptide building blocks. Incorporation of the allo-threonine stereochemistry enables construction of stereochemically defined peptides and peptide analogs for structure-dependent studies of backbone and side-chain recognition.

3. Peptidomimetics And SAR Studies

H-D-allo-Thr-OMe · HCl serves as a chiral feedstock for peptidomimetic construction and structure-activity relationship studies where threonine-like stereochemistry and side-chain hydroxyl positioning are critical. The β-hydroxyl group can be functionalized into ethers, carbonate-like derivatives, or other oxygen-based substituents that modulate hydrogen-bonding patterns and conformational preferences in peptide analogs. The ester-to-amide conversion potential supports generation of constrained or modified scaffolds that retain the allo stereochemical signature while varying functional group identity at the side chain. The resulting analogs can be used to probe how stereochemistry and hydroxyl orientation influence molecular recognition in biochemical assays and medicinal chemistry campaigns.

4. Chemical Biology Labeling

H-D-allo-Thr-OMe · HCl can be employed in chemical biology labeling strategies that require incorporation of a stereodefined threonine analog bearing a hydroxyl functionality for conjugation handles. The β-hydroxyl group enables controlled derivatization to introduce linkers, affinity tags, or reactive moieties for subsequent bioconjugation steps, while the amino ester scaffold supports conversion into peptide-compatible units. The D-allo configuration provides a stereochemical "signature" that can be tracked in labeled peptides or used to generate stereoisomeric controls for mechanistic studies. Downstream, labeled peptide fragments and modified biomolecules prepared from this intermediate can support mapping of binding interfaces, substrate preferences, or post-assembly functional group accessibility.

5. Pharmaceutical Intermediate Preparation

H-D-allo-Thr-OMe · HCl is relevant to pharmaceutical intermediate preparation where chiral amino acid esters act as feedstocks for controlled synthesis of stereodefined building blocks. The methyl ester functionality supports transformation into activated carboxylic acid derivatives and subsequent formation of amide or related linkages under process-compatible conditions. The allo-threonine stereocenter and β-hydroxyl group can be carried through protection, activation, and coupling sequences to build drug-like fragments or peptide-derived intermediates used in fine chemical manufacturing. The HCl salt form also provides a practical means to manage amine handling during scale-up of chiral intermediate preparation and downstream conversion to N-protected amino acid derivatives.

6. Process Chemistry And Fine Chemical Production

H-D-allo-Thr-OMe · HCl is applicable to process chemistry and fine chemical production as a stable, isolable chiral amino acid ester salt that can be converted into multiple downstream formats. The controlled presence of the amine as an HCl salt and the esterified carboxyl group enable stepwise protection-group planning, including hydroxyl protection and selective activation of the ester for coupling or further functionalization. The stereodefined allo-threonine framework supports reproducible manufacturing of stereochemically consistent peptide building blocks and chiral intermediates for synthetic organic chemistry. Downstream utility includes preparation of protected amino acid derivatives, peptide coupling partners, and stereochemical reference materials used across industrial synthesis of amino acid-derived compounds.

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