Fmoc-1,4-trans-ACHC-OH

Fmoc-1,4-trans-ACHC-OH is an Fmoc-protected, chiral amino acid derivative featuring a trans-1,4-disubstituted cyclohexyl-like ACHC scaffold that fixes stereochemistry at the amino-bearing carbon while presenting a free carboxylic acid for peptide coupling. The molecule combines an N-(9H-fluoren-9-ylmethoxycarbonyl) protecting group with a rigid, conformationally biased side chain that can influence backbone geometry in peptides and peptidomimetics. The trans relationship within the cyclohexyl-derived framework supports predictable spatial orientation during amide bond formation, while the carboxylic acid enables standard coupling chemistries after Fmoc removal. The Fmoc carbamate and free acid functionality make the compound a practical chiral intermediate for protected amino acid synthesis and downstream construction of stereodefined peptide analogs.

1. Peptide Synthesis

Fmoc-1,4-trans-ACHC-OH is used in peptide synthesis workflows where Fmoc-based solid-phase or solution-phase strategies require an N-protected amino acid building block with a free C-terminal carboxyl group. The chiral ACHC side-chain framework and trans stereochemistry can be incorporated into peptide sequences to control local conformation and side-chain orientation, supporting peptide coupling chemistry that forms amide bonds at the carboxyl functionality. Fmoc deprotection and subsequent coupling can generate well-defined N-terminal and internal residues with stereochemical integrity, enabling the preparation of conformationally constrained peptides and peptide fragments. The resulting peptide products serve as research-grade scaffolds for studying how rigid amino acid incorporation affects structure and molecular recognition in synthetic peptide chemistry.

2. Peptidomimetics

Fmoc-1,4-trans-ACHC-OH is applied in peptidomimetic construction where a conformationally restricted, trans-1,4 amino acid analog can replace flexible residues to tune pharmacophore geometry. The Fmoc-protected amine supports stepwise assembly of analogs, while the free carboxylic acid enables incorporation into larger amide-linked frameworks that mimic peptide backbones. The stereodefined ACHC scaffold can undergo further functional group transformations after peptide assembly, such as side-chain derivatization or conversion of the carboxyl group into activated intermediates for additional coupling steps. Downstream, the compound can be used to generate stereochemically defined mimetics for structure-activity relationship studies and molecular design libraries in medicinal chemistry research.

3. Side-Chain Functionalization

Fmoc-1,4-trans-ACHC-OH is suitable for amino acid derivatization and side-chain functionalization strategies that exploit the rigid ACHC stereochemical element while maintaining a protected amine during synthetic sequence design. The Fmoc carbamate allows controlled deprotection timing, enabling selective coupling or orthogonal chemistry at later stages, whereas the carboxylic acid provides a handle for activation to form esters, amides, or other downstream coupling partners. The trans stereochemistry can help preserve stereochemical outcomes during derivatization steps that proceed through carboxyl activation or subsequent functional group interconversions. The resulting functionalized amino acid derivatives and conjugation-ready intermediates support chemical biology research, biomolecule labeling, and the preparation of specialized building blocks for complex synthetic targets.

4. Chemical Manufacturing

Fmoc-1,4-trans-ACHC-OH can be employed in process chemistry and fine chemical synthesis as a chiral amino acid intermediate for manufacturing peptide building blocks and stereodefined intermediates. The presence of the Fmoc protecting group and the free carboxylic acid supports robust protection/deprotection logic in multi-step production routes, including staged activation of the acid for coupling or conversion into downstream activated forms. The rigid trans-ACHC scaffold provides a stereochemically defined input that can reduce ambiguity in downstream peptide analog construction where stereochemical fidelity is required. The compound's protected amino acid form aligns with industrial intermediate preparation for peptide reagents, custom synthesis of stereodefined fragments, and scalable production of chiral building blocks used in applied peptide science.

5. Analytical Standards

Fmoc-1,4-trans-ACHC-OH is applicable to analytical research as a stereochemically defined reference material for method development and characterization of Fmoc-amino acid derivatives and peptide analogs containing the ACHC residue. The combination of an identifiable Fmoc chromophore with a free carboxylic acid and a rigid trans stereocenter supports unambiguous detection in chromatographic and spectrometric workflows used to monitor coupling completeness, deprotection efficiency, and stereochemical integrity. The compound can serve as an internal or external standard when verifying the presence of the trans-1,4 configuration in synthesized intermediates or final peptide products. Downstream, the availability of a well-defined chiral building block supports reproducible quality control for research-grade peptide synthesis and characterization pipelines.

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