Fmoc-1,3-cis-ACHC-OH

Fmoc-1,3-cis-ACHC-OH is an Fmoc-protected, chiral amino acid derivative featuring a side chain derived from the 1,3-cis substituted ACHC motif and a free carboxylic acid suitable for peptide coupling chemistry. The stereodefined relationship within the side-chain framework supports consistent conformational preferences during peptide assembly, while the Fmoc group provides orthogonal base-labile protection for the amino functionality. The molecule presents a reactive acid handle for conversion to activated esters or amide-forming intermediates and a protected amine that can be deprotected under standard peptide synthesis conditions to expose the nucleophilic N-terminus. The combination of a chiral center, a protected carbamate, and a carboxylic acid makes Fmoc-1,3-cis-ACHC-OH a practical chiral intermediate for protected amino acid synthesis, peptidomimetic construction, and downstream structure-driven derivatization.

1. Peptide Synthesis

Fmoc-1,3-cis-ACHC-OH is applied in solid-phase peptide synthesis and solution-phase peptide coupling where an Fmoc-protected, stereodefined amino acid building block is required. The Fmoc carbamate masks the amino group during chain elongation, while the free carboxylic acid participates in amide bond formation to install the cis-1,3 side-chain stereochemistry into growing peptides. The defined stereochemical arrangement can help preserve conformational features in helices, turns, or constrained motifs, supporting reproducible peptide analog construction for research-grade sequence libraries. The resulting peptidic products can be further functionalized or used directly as scaffold peptides for biochemical assays and synthetic methodology development.

2. Peptidomimetics

Fmoc-1,3-cis-ACHC-OH is used for peptidomimetic construction in chemical biology and medicinal chemistry-adjacent research where constrained side-chain geometry is a design variable. The amino acid backbone and carboxylic acid enable incorporation into peptide-like frameworks, while the cis-1,3 substituted ACHC side chain can serve as a stereochemical element that influences local folding and receptor-contact geometry. Fmoc protection supports stepwise assembly of analogs that later undergo side-chain functional group transformations or cyclization strategies to generate non-natural scaffolds. Downstream derivatives prepared from this building block can function as SAR-focused molecular probes, conformationally constrained ligands, or reference standards for analytical characterization.

3. Chiral Building Block

Fmoc-1,3-cis-ACHC-OH serves as a chiral amino acid intermediate for stereoselective synthesis planning in synthetic organic chemistry and process chemistry development. The cis-configured stereocenters embedded in the ACHC-derived side chain provide a fixed stereochemical input that can be carried through to final target molecules via amide coupling and subsequent derivatization. The Fmoc group enables controlled protection/deprotection cycles, allowing the compound to be used as a programmable chiral fragment in protected amino acid synthesis workflows. The free carboxylic acid supports conversion into activated coupling forms or further functionalization, enabling downstream preparation of labeled, immobilized, or conjugatable chiral derivatives.

4. Bioconjugation Chemistry

Fmoc-1,3-cis-ACHC-OH can be employed in bioconjugation workflows that require incorporation of a defined stereochemical amino acid unit into peptide linkers or conjugation handles. The Fmoc-protected amine supports peptide assembly to yield linker segments bearing the cis-1,3 side-chain motif, while the carboxylic acid functionality enables formation of amide bonds to biomolecule-reactive groups after activation. The stereodefined side chain can improve reproducibility of conjugate structure by constraining local geometry in the linker region. Prepared conjugation-ready intermediates can be used to generate biomolecule-modified constructs for protein interaction studies, affinity reagent development, or analytical binding assays.

5. Pharmaceutical Intermediate Preparation

Fmoc-1,3-cis-ACHC-OH is suitable for pharmaceutical intermediate preparation where protected amino acid derivatives and stereodefined peptide building blocks are required for manufacturing-oriented synthesis routes. The Fmoc carbamate provides a robust protection strategy for the amino functionality during coupling steps, while the free carboxylic acid supports conversion into activated intermediates compatible with controlled amide formation. The cis-1,3 stereochemistry can be retained through the synthetic sequence to ensure consistent structural definition in peptide-based intermediates used for further elaboration. Downstream processing can include transformation into higher-order peptide fragments, peptidomimetic precursors, or standardized analytical materials used in process development and quality-relevant characterization.

6. Analytical Research Standards

Fmoc-1,3-cis-ACHC-OH is used in analytical research for developing reference materials and method development studies that require stereochemically defined amino acid derivatives. The presence of the Fmoc group and the free carboxylic acid enables unambiguous chromatographic and mass spectrometric identification of the protected amino acid and its coupling-derived forms. The fixed cis-1,3 stereochemistry supports consistent retention behavior and fragmentation patterns when monitoring peptide building blocks, intermediate peptides, or degradation products. Analytical standards derived from this compound can support impurity profiling, peptide synthesis traceability, and structural verification in peptide chemistry and applied process monitoring.

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