Fmoc-1,4-trans-ACHA-OH

Fmoc-1,4-trans-ACHA-OH is an Fmoc-protected, chiral amino acid derivative featuring a trans-1,4-disubstituted side-chain and a free carboxylic acid for downstream peptide coupling. The molecule combines an N-(9H-fluoren-9-ylmethoxycarbonyl) protecting group with a stereodefined amino acid backbone, enabling orthogonal protection logic where Fmoc removal can expose the amine for controlled N-terminal incorporation. The trans relationship across the 1,4-disubstituted framework imposes conformational bias that can influence amide bond geometry and side-chain presentation in peptide and peptidomimetic scaffolds. The free acid functionality supports formation of activated carboxyl derivatives and compatibility with standard amino acid coupling chemistries used in solid-phase and solution-phase synthesis.

1. Peptide Synthesis

Fmoc-1,4-trans-ACHA-OH serves as a protected amino acid building block for peptide assembly in research and manufacturing workflows where N-Fmoc deprotection and subsequent amide formation are required. The Fmoc carbamate masks the amino group during chain elongation, while the free carboxylic acid participates as the coupling partner to generate peptide bonds at the desired residue position. The trans-1,4 stereochemical pattern can be leveraged to tune local backbone/side-chain geometry, supporting the construction of constrained peptides and analogs for structure-function studies. Downstream peptide products can be produced with consistent stereochemical integrity across synthetic batches, aligning with amino acid chemistry requirements for reproducible protected building blocks.

2. Peptidomimetics And SAR

Fmoc-1,4-trans-ACHA-OH is suitable for peptidomimetic construction and structure-activity relationship studies where stereodefined side-chain topology is used to modulate molecular recognition. The chiral amino acid core and trans-1,4 substitution pattern enable incorporation into analog libraries that probe how constrained conformations affect binding-site interactions. The Fmoc-protected amine supports stepwise synthesis of multi-residue scaffolds, while the carboxylic acid allows controlled coupling to diverse partners for SAR panel generation. The resulting peptidomimetic intermediates can be further functionalized at side-chain positions after peptide assembly, supporting iterative medicinal chemistry and biochemical assay development.

3. Chemical Biology Probes

Fmoc-1,4-trans-ACHA-OH supports chemical biology workflows that require incorporation of a stereodefined amino acid residue into labeled peptides or affinity reagents. The protected amine and carboxylic acid enable reliable placement into peptide sequences that later undergo deprotection or cleavage to reveal reactive handles for conjugation strategies. The trans-configured side-chain can help preserve defined three-dimensional presentation of the labeled motif, which may improve the consistency of probe behavior in binding assays or cellular uptake studies. The amino acid derivative can also function as a precursor for generating peptide-based probes that are compatible with downstream bioconjugation chemistry and analytical characterization.

4. Process Chemistry Intermediate

Fmoc-1,4-trans-ACHA-OH is applicable as a chiral, protected amino acid intermediate in process chemistry intermediate preparation for fine chemical synthesis. The Fmoc group provides a robust N-protection handle that can be removed under standard base-mediated conditions, supporting scalable peptide building block manufacturing routes. The presence of a free carboxylic acid enables conversion to activated forms for coupling while maintaining the stereochemical integrity of the trans-1,4 framework through the protected synthesis sequence. Industrial synthesis teams can employ this compound to design reproducible supply of stereodefined residues for peptide-active ingredient manufacturing and specialty peptide production.

5. Side-Chain Functionalization

Fmoc-1,4-trans-ACHA-OH can be used in side-chain functionalization strategies where the trans-1,4 stereochemistry provides a defined spatial scaffold for subsequent derivatization. The amino acid derivative format supports sequential protection/deprotection logic: Fmoc masking during assembly and carboxyl participation during coupling, followed by conversion of the carboxyl functionality into derivatives suitable for further chemistry. The constrained side-chain arrangement can influence reactivity patterns of downstream functional groups introduced via coupling partners or post-assembly transformations, aiding the synthesis of structured analogs and constrained linkers. The resulting functionalized amino acid and peptide intermediates can feed into broader synthetic organic chemistry programs requiring stereocontrolled building blocks.

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