Fmoc-D-methionine sulfone is a protected, amino-acid derivative in which methionine is oxidized to the corresponding sulfone and the amino group is masked with an Fmoc (9-fluorenylmethoxycarbonyl) protecting group. The molecule contains a free carboxyl functional group and an Fmoc-protected amino functionality, while the side chain bears a sulfone (-SO2-) that increases polarity relative to the thioether form and can participate in specific noncovalent interactions during peptide assembly. Fmoc-D-methionine sulfone is used as a building block for stepwise peptide synthesis and for chemical biology or analytical studies where an oxidized methionine side chain analogue is required to probe structure-property relationships or label peptide material.
CAT No: CP01512
Fmoc-D-methionine sulfone is an Fmoc-protected D-configuration methionine derivative in which the thioether side chain is oxidized to a sulfone, yielding a strongly electron-withdrawing, stereochemically defined amino acid building block. The molecule contains an Fmoc carbamate on the α-amino group and a free carboxylate (or carboxyl functionality consistent with peptide-coupling use), enabling controlled N-deprotection and subsequent amide bond formation under standard peptide synthesis conditions. The sulfone side chain provides a polar handle with altered oxidation state and reactivity compared with methionine thioethers, supporting selective transformations and stable incorporation into peptide-like frameworks. The D stereochemistry at the α-carbon supports stereodefined unnatural amino acid incorporation for structure-function studies, while the sulfone oxidation state can influence local conformational preferences and chemical stability of downstream analogs.
1. Peptide Synthesis
Fmoc-D-methionine sulfone is used in peptide building block preparation for solid-phase peptide synthesis and related coupling workflows where orthogonal N-protection is required. The Fmoc carbamate enables stepwise deprotection to generate a reactive amino terminus, while the α-carboxyl functionality participates in peptide coupling to form stable amide linkages. The D stereocenter supports incorporation of stereochemically inverted residues to probe backbone recognition, protease tolerance, and conformational effects in peptide libraries. The sulfone side chain can be retained through synthesis as a polar, oxidation-stable substituent, supporting downstream derivatization or direct use in peptidomimetic sequences.
2. Amino Acid Derivatization
Fmoc-D-methionine sulfone is suitable for amino acid derivatization strategies that exploit the oxidized thioether-to-sulfone functional group as a synthetic intermediate. The sulfone moiety can undergo controlled functional group interconversions under appropriate conditions, enabling access to sulfone-containing analogs, electrophile-bearing side chains, or further oxidation-state tuning relative to methionine derivatives. The Fmoc-protected amino group supports orthogonal protection management, allowing selective side-chain chemistry while maintaining compatibility with peptide coupling later in a synthetic sequence. The resulting sulfone-bearing amino acid derivatives can serve as intermediates for fine chemical synthesis, chiral scaffold elaboration, and side-chain functionalization routes that require stereochemical fidelity.
3. Peptidomimetics And SAR
Fmoc-D-methionine sulfone supports peptidomimetic construction and structure-activity relationship studies where side-chain polarity and stereochemistry are key design variables. The D-configuration residue introduces controlled stereochemical inversion at the α-carbon, which can modulate receptor binding motifs and proteolytic susceptibility in peptide-like scaffolds. The sulfone side chain provides a rigid, polar substituent that can influence hydrogen-bonding patterns, dipole effects, and local conformational preferences compared with unoxidized methionine analogs. Incorporation of this protected amino acid building block into analog series can enable systematic SAR mapping using stereodefined, chemically stable sulfone-containing peptide mimetics.
4. Chemical Biology Probes
Fmoc-D-methionine sulfone is applied in chemical biology research to generate stereochemically defined probes and modified biomolecule precursors. The Fmoc-protected amino functionality supports sequential assembly of peptide conjugates, while the sulfone side chain can serve as a functional handle for downstream chemical modification or conjugation strategies. The D stereocenter can help tune resistance to enzymatic degradation, supporting longer-lived probe formats used for mechanistic studies and target engagement assays in vitro. Sulfone-containing peptide constructs derived from this amino acid intermediate can be used to interrogate binding interfaces and pathway-specific interactions where side-chain polarity and stereochemistry affect molecular recognition.
5. Pharmaceutical Intermediate Preparation
Fmoc-D-methionine sulfone can be used as a process-relevant pharmaceutical intermediate for manufacturing routes that require protected chiral amino acid inputs. The Fmoc-protected N-terminus and defined D stereochemistry support reproducible incorporation into peptide-like intermediates, including protected fragments used for downstream coupling and purification workflows. The sulfone side chain offers chemical stability relative to thioether-containing methionine derivatives, which may reduce sensitivity to oxidation during multi-step synthesis and intermediate handling. The resulting sulfone-containing building blocks can feed into fine chemical synthesis programs that generate stereodefined, functionalized intermediates for drug discovery chemistry and related applied product development.
6. Analytical Research Standards
Fmoc-D-methionine sulfone serves as an analytical research standard and reference material precursor in methods development for amino acid and peptide analysis. The combination of Fmoc protection and the sulfone side chain produces a distinctive mass and fragmentation behavior that can support LC-MS/MS method optimization for protected amino acids, peptide fragments, and side-chain-modified species. D stereochemistry provides an additional stereochemical dimension for chromatographic and spectral discrimination when evaluating stereospecific peptide synthesis outcomes. The compound's defined structure enables consistent preparation of calibration or identification standards for quality-oriented characterization of peptide building block incorporation and side-chain integrity.
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