H-DL-Met-OMe · HCl

H-DL-Met-OMe · HCl is a hydrochloride salt form of the methyl ester of methionine, presented as a DL (racemic) mixture at the α-carbon. The structure contains a protected amino functionality as the amino ester hydrochloride, along with a thioether side chain characteristic of methionine that can participate in nucleophilic and oxidation-state dependent transformations. The ester group supports controlled reactivity during peptide coupling and intermediate elaboration, while the salt form improves handling of the amino acid ester in synthetic workflows. As a chiral amino acid intermediate precursor, H-DL-Met-OMe · HCl can be converted into protected amino acid derivatives and can serve as a feedstock for side-chain functionalization and downstream peptide scaffold construction.

1. Peptide Synthesis

H-DL-Met-OMe · HCl is used in peptide building block preparation where the methionine thioether side chain and esterified carboxyl group enable stepwise conversion into coupling-ready formats. The amino ester hydrochloride can be transformed into N-protected methionine derivatives, supporting standard peptide coupling chemistries while maintaining the side-chain thioether as a functional handle for later oxidation or thioether-to-sulfoxide/sulfone elaboration. The racemic (DL) stereochemistry supports method development and library synthesis where stereochemical uniformity is not the primary constraint. Downstream, the resulting protected methionine intermediates can be incorporated into linear peptides and peptide-like oligomers for structure-activity relationship studies and synthetic methodology development.

2. Amino Acid Derivatization

H-DL-Met-OMe · HCl is applied in amino acid derivatization workflows that target the methionine side-chain and the ester-to-amide conversion sequence. The thioether functionality can undergo controlled oxidation to sulfoxide or further oxidation to sulfone derivatives, enabling functional group tuning for polarity, hydrogen-bond acceptor properties, and chemical reactivity modulation in subsequent synthesis. The methyl ester can be hydrolyzed or transesterified to access carboxylic acid forms, facilitating formation of amides, activated esters, or mixed anhydrides for downstream functionalization. The hydrochloride salt form also supports reproducible intermediate handling during process chemistry intermediate preparation and fine chemical synthesis.

3. Chiral Synthesis Intermediate

H-DL-Met-OMe · HCl is utilized as a chiral amino acid intermediate feedstock in routes that introduce stereochemical control after initial ester formation. The DL configuration at the α-carbon can be carried through early stages of manufacturing or research synthesis, then resolved or stereoselectively transformed via derivative formation and separation strategies when enantiopurity becomes required. The protected amino ester framework supports conversion to N-protected chiral methionine derivatives used for stereochemically defined peptide coupling and stereocontrolled side-chain modifications. Resulting enantiopure or stereochemically enriched methionine derivatives can then support asymmetric synthesis planning for peptide analogs, peptidomimetics, and other amino acid-based chiral scaffolds.

4. Pharmaceutical Intermediate Preparation

H-DL-Met-OMe · HCl is relevant to pharmaceutical intermediate preparation where amino acid ester chemistry and thioether side-chain functionality intersect with medicinal chemistry needs for derivatization. The amino ester hydrochloride can be advanced into protected amino acid derivatives that align with peptide-like fragment assembly and amide bond formation used in drug discovery chemistry. The methionine thioether can be used as a chemical motif that may be oxidized to alter physicochemical properties of intermediates, supporting SAR studies that require systematic functional group variation. Downstream, the compound can serve as a practical starting point for manufacturing route design to amino acid-derived fragments and intermediates used in fine chemical production.

5. Chemical Biology Labeling

H-DL-Met-OMe · HCl can be employed in chemical biology labeling and probe synthesis where methionine-derived fragments are incorporated into biomolecule-reactive constructs. The amino ester hydrochloride format enables conversion to N-protected amino acid building blocks that can be coupled into peptide tags or used to generate methionine-containing linkers for biomolecule modification. The thioether side chain provides a chemically addressable site that can be oxidized to sulfoxide/sulfone forms, which may influence reactivity and stability of labeled conjugates during analytical characterization. Resulting methionine-bearing intermediates can be used to construct molecular probes, peptide conjugates, and labeling reagents for biochemical research intermediate generation and analytical method development.

6. Process Chemistry Intermediate

H-DL-Met-OMe · HCl is suitable for process chemistry intermediate preparation because the amino acid ester hydrochloride form supports controlled handling and conversion into downstream protected amino acid derivatives. The combination of an esterified carboxyl group and a salt-stabilized amino functionality enables predictable transformations such as protection, ester hydrolysis, and activation for coupling steps in multi-step manufacturing sequences. The methionine thioether side chain can be preserved through early stages or selectively oxidized when a defined oxidation state is required for later synthetic logic. Industrially relevant downstream outputs include protected methionine building blocks, activated carboxylic acid forms, and peptide coupling-ready intermediates that support specialty chemical production and industrial chemical manufacturing workflows.

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