H-D-Met-OMe*HCl

H-D-Met-OMe*HCl is a chiral methionine methyl ester hydrochloride in which the amino terminus is acetylated (H-D-Met-OMe) and the side chain retains the thioether functionality characteristic of methionine. The D-configuration at the α-carbon provides stereochemical control for incorporation into peptide-like frameworks and for preparing enantiopure chiral intermediates. The esterified carboxyl group (OMe) and the hydrochloride salt form influence solubility and reactivity, enabling controlled downstream transformations such as ester hydrolysis, conversion to activated carboxylic acids, or peptide coupling after appropriate functional group adjustments. The presence of a protected N-acetyl motif and a stable thioether side chain makes the compound compatible with protected amino acid chemistry and methionine analog synthesis workflows.

1. Protected Amino Acid Chemistry

H-D-Met-OMe*HCl is used in protected amino acid synthesis and intermediate preparation where the N-acetylated amino group and esterified carboxyl handle typical peptide-coupling workflows. The D-methionine stereocenter and the thioether side chain allow stereochemically defined building block construction while maintaining a functional side chain that can be carried through coupling steps. The hydrochloride salt form can facilitate handling and can be converted into a coupling-ready carboxylic acid derivative via ester hydrolysis followed by activation. Downstream use commonly includes generating D-methionine-containing peptide building blocks and chiral fragments for fine chemical synthesis.

2. Peptide Coupling Building Blocks

H-D-Met-OMe*HCl serves as a peptide building block precursor for constructing D-Met-containing peptides and peptidomimetic sequences in solid-phase or solution-phase synthesis strategies. The amino functionality is masked as an acetamide, supporting chemoselective peptide bond formation after converting the methyl ester to an acid (or an activated ester/acid chloride equivalent under appropriate conditions). The D-configuration enables stereochemical labeling of peptide backbones and supports structure-activity relationship studies that differentiate L- versus D-residue contributions. The methionine thioether can be retained during assembly to maintain side-chain identity, enabling subsequent oxidation-state controlled transformations when required for downstream analog generation.

3. Chiral SAR And Molecular Design

H-D-Met-OMe*HCl is applied in molecular design and SAR studies where methionine-derived stereochemical elements are incorporated to probe conformational and recognition effects. The α-chiral center in the D-amino acid form supports enantiopure library synthesis and allows systematic comparison against L-methionine analogs. The ester group enables modular intermediate handling for rapid conversion into alternative functional groups used in fragment elaboration, while the thioether side chain can participate in chemical modification strategies that tune polarity and reactivity. The resulting D-methionine-containing derivatives can be used to generate peptide analogs and constrained scaffolds for biochemical assay panels and structure-guided optimization.

4. Side-Chain Functionalization Routes

H-D-Met-OMe*HCl is suitable for side-chain functionalization workflows that leverage the methionine thioether as a chemically addressable handle in synthetic organic chemistry. The thioether can be carried through initial derivatization steps as a stable motif, while the ester and N-acetyl functionalities allow orthogonal transformations such as ester hydrolysis, activation, or selective deprotection depending on the target derivative. The hydrochloride salt form supports controlled preparation of reactive intermediates for subsequent conjugation or scaffold diversification. Downstream utility includes producing methionine-based analogs used in peptidomimetics, chemical biology probes, and intermediate streams for broader amino acid derivative manufacturing.

5. Pharmaceutical Intermediate Preparation

H-D-Met-OMe*HCl is used in pharmaceutical intermediate preparation where stereodefined amino acid derivatives are required for manufacturing routes to peptide-like or peptidomimetic compounds. The protected N-acetyl group and methyl ester format support stepwise conversion into coupling-ready carboxylic acid derivatives and can be integrated into process chemistry intermediate sequences. The D-stereochemistry enables controlled synthesis of enantiopure building blocks used for downstream assembly and derivatization in specialty chemical production. The thioether side chain provides a recognizable methionine motif that can be maintained or transformed during later stages of intermediate generation, aligning with industrial amino acid derivative synthesis practices.

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