Fmoc-4-Amc-OH

Fmoc-4-Amc-OH is an Fmoc-protected amino acid derivative featuring a chiral amino acid core bearing a 4-amino-methyl-cyclohexane (4-Amc) side chain and an N-(9H-fluoren-9-ylmethoxycarbonyl) protecting group. The molecule combines an N-Fmoc carbamate with a free carboxylic acid, providing orthogonal reactivity for solid-phase peptide synthesis while maintaining stereochemical integrity at the amino acid center. The cyclohexyl-like, conformationally constrained side chain can influence local geometry during peptide coupling and can serve as a scaffold for side-chain functionalization. The presence of both a protected amine and an unprotected acid makes Fmoc-4-Amc-OH a practical chiral intermediate for downstream derivatization, peptide analog construction, and structure-driven synthetic studies.

1. Peptide Synthesis

Fmoc-4-Amc-OH is used in peptide building workflows where N-Fmoc protection supports standard peptide coupling and controlled deprotection cycles on solid supports. The free carboxylic acid participates in amide bond formation, while the Fmoc group enables orthogonal handling of the amino functionality during chain elongation. The conformationally constrained 4-Amc side chain can be incorporated to modulate backbone/side-chain packing in peptide sequences, supporting the preparation of analog series for peptide science. Fmoc-4-Amc-OH therefore functions as a chiral, side-chain-defined residue for peptide building block preparation and subsequent peptide assembly.

2. Peptidomimetics Design

Fmoc-4-Amc-OH is applied in peptidomimetic and molecular scaffold design where a protected amino acid derivative provides a defined stereochemical handle for constructing non-natural peptide-like structures. The cyclohexane-derived side chain can be leveraged to tune hydrophobic surface, conformational bias, and steric profile, which are key parameters in peptidomimetic SAR studies. The Fmoc-protected amine supports iterative synthesis of analogs, while the carboxylic acid enables conversion to amides or other activated derivatives for scaffold diversification. Downstream use can include generation of constrained analogs for receptor-binding studies, biochemical assay development, and synthetic methodology evaluation in amino acid chemistry.

3. Chemical Biology Labeling

Fmoc-4-Amc-OH is suitable for chemical biology research that requires amino acid-based handles for conjugation and probe construction. The unprotected carboxyl group can be transformed into coupling-ready activated esters or amide-forming derivatives, enabling attachment to biomolecule scaffolds or linkers after Fmoc deprotection when appropriate. The side-chain architecture of the 4-Amc moiety can help maintain defined spatial presentation of the attachment point, supporting consistent probe geometry in labeling experiments. Fmoc-4-Amc-OH thus serves as a chiral intermediate for biomolecule modification strategies and for constructing amino acid-derived tags used in biochemical research workflows.

4. Protected Amino Acid Chemistry

Fmoc-4-Amc-OH is employed as an N-Fmoc protected amino acid intermediate for controlled orthogonal protection strategies in synthetic organic chemistry. The Fmoc carbamate provides a removable protecting group for the amino functionality, while the free carboxylic acid supports activation and coupling chemistry without requiring additional acid protection. The chiral center and conformationally defined side chain enable stereochemically consistent derivatization, including preparation of peptide coupling partners, amide derivatives, and intermediate fragments for longer synthetic sequences. Fmoc-4-Amc-OH can be applied to process development for protected amino acid synthesis where predictable deprotection and coupling compatibility are required.

5. Process Chemistry Intermediate

Fmoc-4-Amc-OH is used in process chemistry and fine chemical synthesis contexts as a manufacturable chiral intermediate for producing Fmoc-compatible amino acid building blocks. The combination of an Fmoc-protected amine and a free acid aligns with industrially scalable peptide synthesis supply chains, where orthogonal functional groups simplify downstream conversion to activated coupling forms or peptide-ready residues. The stable carbamate protection supports handling through intermediate steps, while the acid functionality enables conversion into derivatives suitable for manufacturing routes toward peptide analogs and specialty intermediates. Fmoc-4-Amc-OH therefore supports industrial intermediate preparation for amino acid derivative manufacturing and chiral scaffold production.

6. Analytical Research Standards

Fmoc-4-Amc-OH can be applied in analytical research as a reference material for method development and characterization of Fmoc-based peptide intermediates and amino acid derivatives. The defined Fmoc group and the 4-Amc side chain provide a characteristic mass/fragmentation signature for LC-MS, while the free carboxylic acid supports reproducible derivatization or ionization behavior in analytical workflows. The stereochemically defined structure also supports calibration needs when distinguishing closely related chiral amino acid building blocks. Fmoc-4-Amc-OH thus functions as an analytical standard and characterization anchor for peptide synthesis monitoring, impurity profiling, and amino acid derivative method validation.

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