Fmoc-Cys((RS)-2,3-di(palmitoyloxy)-propyl)-OH is an Fmoc-protected cysteine derivative in which the thiol side chain is substituted with a (RS)-configured 2,3-di(palmitoyloxy)propyl group, yielding a modified, non-native thioether-bearing amino acid building block for peptide chemistry. The molecule contains an N-terminal Fmoc carbamate and a free carboxylic acid, while the cysteine α-amino and carboxyl functionalities are positioned for coupling and the side-chain substituent presents two palmitoyloxy ester groups that increase hydrophobic character and provide lipid-mimetic functionality. In synthesis, the protected cysteine scaffold supports stepwise peptide assembly under controlled chemoselectivity, and the lipid-like di(palmitoyloxy)propyl handle can be used in structure-activity studies, membrane-mimetic peptide design, or chemical biology workflows requiring hydrophobic surface presentation.
Fmoc-Cys((RS)-2,3-di(palmitoyloxy)-propyl)-OH is an Fmoc-protected cysteine derivative bearing a thioether side chain substituted with a chiral, glycerol-like 2,3-di(palmitoyloxy)propyl group. The molecule contains an α-amino acid backbone masked as an Fmoc carbamate, a free carboxylic acid for coupling chemistry, and a stereogenic center within the side-chain acetal/glycerol motif that is specified as (RS) for the substituted carbon(s). The bulky, lipophilic di-palmitate substituent introduces amphiphilic character and long-chain hydrophobicity, while the cysteine sulfur remains in a thioether form that can participate in thioether-stable peptide architectures and downstream lipid conjugate manipulations. The protected amine and acid functionality make the compound compatible with solid-phase peptide synthesis and with orthogonal protection/deprotection strategies used to control N-terminus formation and side-chain derivatization in peptide and peptidomimetic workflows.
1. Peptide Synthesis
Fmoc-Cys((RS)-2,3-di(palmitoyloxy)-propyl)-OH supports peptide building block preparation for solid-phase peptide synthesis where the Fmoc group enables controlled N-terminal deprotection and coupling. The cysteine scaffold provides a sulfur-containing side-chain handle that remains stable as a thioether under standard peptide assembly conditions, while the free carboxylic acid participates in amide bond formation to incorporate the residue at defined positions. The (RS)-configured lipophilic 2,3-di(palmitoyloxy)propyl substituent can be used to generate lipidated peptide sequences, including amphiphilic conjugates that may influence aggregation state and membrane association behavior during peptide science experiments. Downstream, the resulting lipid-peptide conjugates can be carried into further functionalization steps such as selective side-chain modifications or conversion into peptidomimetic scaffolds for structure-function studies.
2. Bioconjugation Chemistry
Fmoc-Cys((RS)-2,3-di(palmitoyloxy)-propyl)-OH serves in bioconjugation workflows aiming to install long-chain lipid motifs onto peptide carriers and biomolecule-recognition ligands. The Fmoc-protected amine and carboxylic acid allow the residue to be incorporated into peptide linkers that later undergo deprotection or cleavage to expose reactive termini for conjugation chemistry. The di(palmitoyloxy)propyl group introduces two ester-linked palmitate units, enabling controlled hydrophobic anchoring and potential tuning of conjugate partitioning in aqueous systems. The (RS) stereochemical specification supports the preparation of stereodefined lipidated conjugate libraries, which can be used to probe how side-chain stereochemistry and lipid packing affect biomolecular interactions in chemical biology research.
3. Peptidomimetics And SAR Studies
Fmoc-Cys((RS)-2,3-di(palmitoyloxy)-propyl)-OH can be applied to peptidomimetic construction where cysteine-derived side-chain topology is used to emulate lipidated motifs found in bioactive peptide analogs. The protected amino acid format enables systematic variation of the lipidated side chain while maintaining a consistent backbone geometry for structure-activity relationship studies. The bulky, amphiphilic palmitate substituents can modulate conformational preferences and intermolecular association, making the residue suitable for generating analog series that compare different stereochemical outcomes and lipid substitution patterns. The resulting lipid-peptide mimetics can function as molecular probes for SAR investigations, supporting downstream analytical characterization and iterative design of amino acid-derived scaffolds.
4. Pharmaceutical Intermediate Preparation
Fmoc-Cys((RS)-2,3-di(palmitoyloxy)-propyl)-OH is suitable as a process chemistry intermediate for manufacturing lipidated peptide intermediates used in pharmaceutical research pipelines. The Fmoc carbamate provides a robust N-protection strategy that is compatible with scalable peptide coupling operations, while the free carboxylic acid supports conversion into activated derivatives for controlled incorporation into larger sequences. The di(palmitoyloxy)propyl substituent contributes defined hydrophobic functionality that can be carried through downstream synthesis steps to produce lipidated active fragments or excipient-like peptide conjugates. The stereochemical (RS) labeling supports reproducible intermediate specification for batch-to-batch consistency when preparing stereochemical mixtures for subsequent purification and characterization workflows.
5. Analytical Research Standards
Fmoc-Cys((RS)-2,3-di(palmitoyloxy)-propyl)-OH can be employed in analytical research as a reference material for method development targeting Fmoc-peptide fragments and lipidated cysteine-containing species. The combination of an Fmoc-protected nitrogen, a carboxylic acid, and two palmitate ester groups yields distinct chromatographic and mass spectrometric signatures that can help validate peptide coupling performance and monitor deprotection or side-chain integrity. The (RS) stereochemical feature enables analytical workflows that distinguish stereochemical isomers or assess stereochemical stability during derivatization and purification. The compound can therefore serve as a biochemical research intermediate for calibrating analytical assays used to characterize lipid-peptide conjugates, supporting reliable identification of amino acid derivative structures in synthetic and downstream processing contexts.
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