Fmoc-S-allyloxy-amidomethyl-D-cysteine is a protected, sulfur-functionalized cysteine derivative used as an amino acid building block for peptide synthesis, featuring a cysteine backbone bearing a side-chain thioether masked as an S-allyloxy group and a carboxyl functionality converted to an amidomethyl (-CH2-NH-) protected form. The molecule contains an N-terminal Fmoc protecting group and an allyloxy substituent on sulfur that can be removed under conditions that deprotect ether-linked groups, while the stereochemical designation "D" indicates the D-configuration at the cysteine α-carbon. In synthesis, this protected amino acid is employed to control chemoselectivity during coupling and to introduce a cysteine-derived residue with a sulfur-protecting handle suitable for subsequent side-chain deprotection and downstream functionalization in peptide and peptide-conjugate preparation.
CAT No: CP00630
Fmoc-S-allyloxy-amidomethyl-D-cysteine is a D-cysteine-derived, Fmoc-protected amino acid building block featuring a side-chain sulfur masked as an S-allyloxy thioether and a carboxyl group converted to an amidomethyl ester. The molecule contains a chiral center at the cysteine backbone, enabling stereochemically defined incorporation into peptide sequences and cysteine-containing analogs. The Fmoc group provides orthogonal base-labile protection for the α-amino function, while the allyloxy thioether and amidomethyl carboxyl protection establish chemically distinct deprotection handles compatible with stepwise peptide assembly. The sulfur substituent and protected carboxyl functionality support controlled reactivity during coupling, side-chain modification, and downstream conversion to thiol, thioether, or thioether-functionalized peptide derivatives.
1. Peptide Synthesis
Fmoc-S-allyloxy-amidomethyl-D-cysteine is applied in solid-phase peptide synthesis workflows where orthogonally protected cysteine is required for reliable peptide coupling and controlled side-chain chemistry. The Fmoc group supports standard N-terminal activation/deprotection cycles, while the amidomethyl carboxyl protection can behave as a masked C-terminal functionality for peptide fragment handling and sequence assembly. The D-configuration at the cysteine stereocenter enables preparation of stereodefined cysteine residues for peptide libraries and stereochemical studies. The S-allyloxy thioether protection allows later side-chain unveiling or transformation, supporting generation of cysteine-derived peptide analogs for structure-function investigations and synthetic peptide material production.
2. Side-Chain Functionalization
Fmoc-S-allyloxy-amidomethyl-D-cysteine is utilized for side-chain functionalization strategies in which the cysteine sulfur is protected as an allyloxy thioether to regulate nucleophilicity during peptide coupling. The presence of the allyloxy substituent provides a handle for subsequent sulfur chemistry, enabling conversion to thiol-reactive intermediates or controlled thioether formation after peptide assembly. The amidomethyl carboxyl group supports downstream C-terminal modification routes, including conversion to amide or other carboxyl-derived motifs depending on the synthetic plan. Stereochemically defined D-cysteine incorporation can be leveraged to probe how sulfur stereochemistry and side-chain orientation influence molecular recognition in peptide-based scaffolds and biochemical research reagents.
3. Chemical Biology Conjugation
Fmoc-S-allyloxy-amidomethyl-D-cysteine serves in chemical biology workflows that require cysteine-bearing peptide conjugation reagents with controlled sulfur reactivity. The protected thiol surrogate (S-allyloxy) helps maintain low background reactivity during preparation of peptide conjugates, while the Fmoc-protected α-amino functionality supports incorporation into peptide carriers that can later be processed into conjugation-ready forms. The D-cysteine stereocenter can be used to generate stereodefined conjugates for studying binding selectivity, protease sensitivity, or conformational effects in peptide-tagged biomolecular probes. The orthogonal protection pattern supports stepwise derivatization into thiol-reactive or thioether-linked constructs used in biomolecule labeling, affinity probes, and research-grade conjugate generation.
4. Peptidomimetics And SAR
Fmoc-S-allyloxy-amidomethyl-D-cysteine is suitable for peptidomimetic and SAR-focused synthesis where cysteine-containing motifs must be introduced with predictable stereochemistry and functional group compatibility. The Fmoc-protected amino group enables construction of peptide-like backbones that incorporate D-cysteine residues without disrupting side-chain protection, supporting iterative analog generation. The S-allyloxy thioether and amidomethyl carboxyl protection provide staged functional-group unveiling, enabling access to thiol-derived linkages, thioether substitutions, or C-terminal modifications used to tune physicochemical properties. The resulting cysteine-rich analogs can be applied as research intermediates for structure-activity relationship studies, fragment-based scaffold optimization, and molecular design campaigns requiring controlled cysteine chemistry.
5. Pharmaceutical Manufacturing Intermediate
Fmoc-S-allyloxy-amidomethyl-D-cysteine is relevant to pharmaceutical manufacturing and fine chemical production settings that require robust, scalable protected amino acid inputs for peptide intermediate preparation. The Fmoc protection strategy supports standardized N-protection/deprotection logic used in peptide process development, while the amidomethyl carboxyl protection provides a defined route to C-terminal peptide fragment handling. The orthogonal side-chain sulfur protection (S-allyloxy) can be managed to minimize undesired oxidation or side reactions during bulk synthesis and purification steps. The stereodefined D-cysteine building block supports manufacturing of stereochemically consistent peptide intermediates and research-grade peptide APIs or peptide-like intermediates used in applied product development and industrial chemical manufacturing pipelines.
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