Bzl-D-Met-OMe*HCl

Bzl-D-Met-OMe*HCl is a D-methionine derivative presented as the hydrochloride salt, featuring a benzyl (Bzl) protecting group on the amino functionality and a methyl ester (OMe) at the carboxyl terminus. The D stereochemistry at the α-carbon defines a chiral amino acid framework that can be carried through peptide coupling and downstream stereospecific transformations. The side chain contains a thioether sulfur characteristic of methionine chemistry, enabling selective oxidation to sulfoxide/sulfone motifs and related functional group interconversions. As a protected amino acid ester hydrochloride, it is designed to participate in controlled peptide building block preparation and to withstand common coupling conditions while maintaining compatibility with standard N-protection and ester-based synthetic strategies.

1. Peptide Synthesis

Bzl-D-Met-OMe*HCl is used in peptide synthesis workflows where a D-methionine residue is required with orthogonal reactivity control. The benzyl-protected amine and methyl ester provide protected N- and C-termini that can be activated for coupling while minimizing side reactions from the α-carboxylate and amino groups. The thioether side chain can be retained for methionine-like behavior or converted post-assembly to sulfoxide/sulfone analogs to probe oxidation-state effects in peptide backbones. The resulting D-configured peptide intermediates support sequential elongation and can feed into peptidomimetic construction and stereochemically defined peptide libraries.

2. Side-Chain Functionalization

Bzl-D-Met-OMe*HCl serves as a chiral methionine-derived intermediate for side-chain functionalization strategies targeting sulfur oxidation state modulation. The thioether sulfur can be chemically transformed to sulfoxide or sulfone functionalities, enabling access to oxidation-sensitive analogs and altered polarity/recognition profiles in peptide or small-molecule contexts. The N-benzyl and C-methyl ester protections help maintain the amino acid core during sulfur oxidation and subsequent coupling or deprotection steps. Downstream derivatives generated from this intermediate can be applied to structure-activity relationship studies, oxidation-state mapping, and synthetic construction of sulfur-functional peptidomimetics.

3. Protected Amino Acid Chemistry

Bzl-D-Met-OMe*HCl is suitable for protected amino acid synthesis and intermediate preparation where salt formation improves handling and defines the protonation state during synthetic operations. The benzyl (Bzl) N-protection strategy supports controlled deprotection under hydrogenolysis-compatible conditions, while the methyl ester (OMe) enables activation to carboxyl derivatives for peptide coupling or further ester-to-acid/amide conversion. The D configuration provides a stereodefined chiral center for asymmetric incorporation into peptide building blocks and for producing unnatural stereochemical patterns in analog series. The compound can be employed as a chiral amino acid intermediate in fine chemical synthesis routes that require predictable protection-group behavior and downstream transformation to peptide-ready forms.

4. Bioconjugation Chemistry

Bzl-D-Met-OMe*HCl can be applied in bioconjugation chemistry where methionine-based linkers or residues are incorporated into conjugates with controlled stereochemistry. The protected amino acid ester form supports conversion into activated carboxyl derivatives or amide-forming handles that can be used to attach to biomolecule scaffolds while keeping the D-methionine stereocenter intact. The thioether side chain can be used as a chemical handle for oxidation-state-dependent conjugate stability or for generating sulfur-oxidized motifs that may alter reactivity toward subsequent derivatization steps. The resulting conjugation-ready intermediates support molecular modification of peptides, peptide-like linkers, and biomolecule-adjacent constructs used in chemical biology research.

5. Pharmaceutical Manufacturing

Bzl-D-Met-OMe*HCl is relevant to pharmaceutical manufacturing and process chemistry as a stereodefined, protected amino acid intermediate for producing peptide-based or peptide-containing intermediates at scale. The benzyl-protected amine and methyl ester enable standardized handling as a building block that can be converted into coupling-ready species in controlled process sequences, while the hydrochloride salt form can improve material manageability during downstream operations. The methionine thioether functionality can be carried through to the manufacturing route or transformed into oxidized sulfur analogs when formulation or analytical targets require altered chemical properties. The compound's protection-group logic aligns with industrial synthesis needs for predictable deprotection/coupling compatibility and reliable generation of D-methionine-containing intermediates.

6. Analytical Research

Bzl-D-Met-OMe*HCl is used in analytical research as a defined chiral reference material and derivatization precursor for method development involving amino acid derivatives. The protected N- and ester functionalities allow reproducible conversion to peptide-like or carboxyl-activated forms that can be used to generate analyte standards with matched protection states. The D stereochemistry and methionine sulfur motif enable targeted monitoring of stereochemical incorporation and sulfur oxidation-state transformations in analytical workflows. The compound can be employed to support LC/GC method validation, impurity profiling of protected amino acid intermediates, and characterization of sulfur-functional peptide analogs used in biochemical research intermediate studies.

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