Fmoc-1,2-trans-ACHC-OH

Fmoc-1,2-trans-ACHC-OH is an Fmoc-protected, trans-configured amino acid derivative bearing a chiral 1,2-amino alcohol motif within the ACHC (amino cyclohexyl carboxylic) framework, with a free carboxylic acid for coupling. The molecule contains an N-Fmoc protecting group that enables solid-phase peptide assembly through base-labile deprotection, while the trans stereochemistry across the adjacent carbon centers supports stereochemically defined incorporation into peptide sequences or peptidomimetic scaffolds. The amino alcohol functionality provides hydrogen-bonding and can be selectively protected or derivatized to tune reactivity during peptide coupling, side-chain functionalization, and downstream transformations. The presence of both a protected amine and an unprotected acid makes the compound a practical chiral building block for protected amino acid synthesis and stereocontrolled peptide chemistry.

1. Peptide Synthesis

Fmoc-1,2-trans-ACHC-OH is applied in peptide building block preparation for automated solid-phase peptide synthesis and related coupling workflows. The Fmoc-protected amine supports controlled N-deprotection cycles, while the free carboxylic acid participates in standard peptide coupling chemistry to form amide bonds at the C-terminus of the inserted residue. The trans amino alcohol stereochemistry can be retained during assembly, enabling the construction of peptides with defined side-chain geometry that can influence conformational preferences and local hydrogen-bond networks. Downstream peptide analogs prepared from this residue can be used as research-grade scaffolds for studying stereochemical effects in sequence-defined molecular recognition.

2. Peptidomimetics And SAR Studies

Fmoc-1,2-trans-ACHC-OH is suitable for peptidomimetic construction where a constrained chiral amino alcohol side chain is used to emulate or modulate backbone and side-chain interactions. The cyclohexyl carboxylate framework and trans-configured 1,2-amino alcohol can be leveraged to introduce stereodefined hydrogen-bond donors/acceptors and rigidify local structure in non-natural peptide analogs. The Fmoc handle enables iterative assembly into larger scaffolds, while the free acid supports conversion to activated derivatives for incorporation into medicinal chemistry libraries. Structure-activity relationship studies can employ analog series derived from this residue to probe how stereochemistry and side-chain functionality affect binding-relevant conformations without changing core scaffold composition.

3. Side-Chain Functionalization

Fmoc-1,2-trans-ACHC-OH can be used in amino acid modification and side-chain functionalization strategies that exploit the amino alcohol functionality for selective derivatization. The trans stereocenters provide a defined spatial arrangement for installing secondary functional groups, such as protected hydroxyl variants, ether or ester formation, or conversion to electrophilic intermediates for subsequent coupling. The Fmoc group enables orthogonal protection management, allowing deprotection when needed while maintaining chemoselectivity for transformations at the side-chain hydroxyl or amine. Functionalized derivatives generated from this intermediate can serve as downstream building blocks for conjugation chemistry, fragment elaboration, and synthesis of stereochemically constrained chemical probes.

4. Chemical Biology Probes

Fmoc-1,2-trans-ACHC-OH is relevant to chemical biology research that requires stereochemically defined peptide-like probes for target engagement and pathway mapping. The amino acid residue format supports incorporation into labeled or affinity-tagged constructs, while the amino alcohol side chain can contribute to controlled hydrogen-bonding patterns that influence recognition. The Fmoc-protected N-terminus allows assembly of probe scaffolds with sequence-defined placement of the chiral residue, and the free carboxylic acid enables further derivatization into conjugation-ready intermediates. Biomolecule-modifying probe candidates prepared from this building block can be used to generate structure-defined tools for investigating molecular interactions in biochemical assays.

5. Pharmaceutical Manufacturing Intermediates

Fmoc-1,2-trans-ACHC-OH is applicable to process chemistry and pharmaceutical intermediate preparation where protected amino acid building blocks are manufactured for downstream peptide or peptidomimetic synthesis. The Fmoc protecting group provides a robust, base-labile protection strategy compatible with common manufacturing workflows that rely on controlled deprotection and coupling steps. The defined trans stereochemistry and the presence of both an Fmoc-protected amine and a free acid support consistent incorporation into larger sequences during scale-up, reducing ambiguity in stereochemical outcomes. Industrial use can focus on producing standardized chiral intermediates for fine chemical synthesis and specialty chemical production of peptide-based research materials and peptidomimetic candidates.

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