Fmoc-Cys(3-(Boc-amino)-propyl)-OH

Fmoc-Cys(3-(Boc-amino)-propyl)-OH is an Fmoc-protected cysteine derivative bearing a thioether side chain substituted with a protected aminopropyl unit (Boc-amino). The molecule contains an Fmoc carbamate on the amino terminus, a carboxylic acid suitable for peptide coupling, and a stereogenic center at the cysteine residue that is preserved as a chiral amino acid building block. The side chain features a thioether linkage that can participate in orthogonal functionalization and a Boc-protected primary amine that enables controlled deprotection and subsequent derivatization. The combination of protected amine functionality and peptide-ready carboxyl group supports stepwise synthesis of extended side-chain architectures and downstream peptide or peptidomimetic constructs.

1. Peptide Synthesis

Fmoc-Cys(3-(Boc-amino)-propyl)-OH is applied in solid-phase peptide synthesis and solution-phase peptide assembly where an Fmoc-protected, side-chain functional amino acid building block is required. The Fmoc carbamate supports orthogonal N-deprotection under base-mediated conditions, while the free carboxylic acid enables amide bond formation using standard peptide coupling chemistries. The Boc-protected aminopropyl side chain can remain masked during chain elongation, limiting side reactions and enabling later side-chain activation after peptide assembly. The resulting peptides can incorporate extended, amino-functionalized thioether side chains for studying intramolecular interactions, improving solubility, or providing handles for further conjugation.

2. Bioconjugation Chemistry

Fmoc-Cys(3-(Boc-amino)-propyl)-OH is used as a chemical biology intermediate to introduce protected amino functionality into peptide scaffolds prior to conjugation workflows. The thioether-bearing cysteine framework provides a stable sulfur-containing linkage for constructing conjugatable biomolecule derivatives, while the Boc-protected primary amine enables controlled generation of an unprotected nucleophile when deprotected at the appropriate stage. The carboxyl group and Fmoc protection support incorporation into peptide carriers that can later be functionalized with electrophiles, activated esters, or coupling partners for labeling and target-binding studies. Downstream derivatives can be designed for biomolecule labeling, affinity reagent construction, and modular assembly of functional peptide conjugates.

3. Protected Amino Acid Chemistry

Fmoc-Cys(3-(Boc-amino)-propyl)-OH serves as a chiral, orthogonally protected amino acid intermediate for synthesis planning that requires staged deprotection and side-chain functional group tolerance. The dual protection pattern (Fmoc on the α-amine and Boc on the side-chain amine) allows selective removal of one protecting group while preserving the other, supporting sequential functionalization strategies. The thioether side chain stabilizes the sulfur-containing substituent during peptide coupling and routine intermediate handling, while the stereodefined cysteine center maintains configurational integrity for structure-dependent studies. The compound can be employed to prepare N-protected amino acid derivatives, side-chain modified peptides, and peptidomimetic precursors where orthogonality is required for controlled downstream transformations.

4. Peptidomimetics And SAR Studies

Fmoc-Cys(3-(Boc-amino)-propyl)-OH is suitable for peptidomimetic construction and structure-activity relationship investigations that depend on systematic variation of side-chain length and functional group placement. The aminopropyl extension on the cysteine side chain provides a tunable spatial element for hydrogen-bonding and electrostatic interactions once the Boc group is removed, while the thioether linkage can influence conformational preferences and local polarity. The Fmoc-protected α-amino group enables incorporation into analog libraries with consistent backbone chemistry, supporting parallel synthesis of related structures. The resulting analogs can be used as research reagents to probe binding-site complementarity, evaluate side-chain recognition motifs, and generate chemically defined scaffolds for SAR mapping.

5. Pharmaceutical Intermediate Preparation

Fmoc-Cys(3-(Boc-amino)-propyl)-OH can be applied as a process-relevant intermediate in the manufacture of functionalized peptide building blocks used in industrial fine chemical synthesis. The presence of a peptide-compatible carboxylic acid, an Fmoc-protected nitrogen, and a Boc-protected side-chain amine supports scalable, stepwise assembly routes where orthogonal protection reduces impurity formation from uncontrolled nucleophilicity. The stereodefined cysteine residue supports reproducible incorporation into larger peptide intermediates, which is important for downstream synthesis of chemically consistent active or research-grade peptide materials. The compound's protected functional groups enable controlled conversion into extended side-chain derivatives that can be further processed into conjugatable or formulation-relevant peptide intermediates.

6. Specialty Chemical Production

Fmoc-Cys(3-(Boc-amino)-propyl)-OH is used in specialty chemical production where amino acid-derived, side-chain functional building blocks are required for constructing functional polymers, crosslinkers, or modular conjugation reagents. The Boc-protected aminopropyl moiety can be deprotected to generate a primary amine for subsequent coupling to activated monomers, isocyanates, aldehydes, or carboxylate-reactive partners, while the thioether-containing cysteine scaffold provides a sulfur-bearing linkage that can remain stable under many synthetic conditions. The Fmoc group supports controlled attachment to peptide-like backbones or Fmoc-based assembly platforms, enabling reproducible incorporation into larger molecular architectures. The resulting derivatives can serve as chemically defined intermediates for functional material development and industrial chemical manufacturing workflows that rely on amino acid chemistry for precise structural control.

1. Characterization of Novel P-Selectin Targeted Complement Inhibitors in Murine Models of Hindlimb Injury and Transplantation

2. Myotropic activity and immunolocalization of selected neuropeptides of the burying beetle Nicrophorus vespilloides (Coleoptera: Silphidae)

3. SERS spectrum of the peptide thymosin‐β4 obtained with Ag nanorod substrate

4. TMEM16F and dynamins control expansive plasma membrane reservoirs

5. An Open-label, Single-center, Safety and Efficacy Study of Eyelash Polygrowth Factor Serum