Fmoc-D-cis-Hyp-OH

Fmoc-D-cis-Hyp-OH is an Fmoc-protected D-configured amino acid derivative of cis-hydroxyproline, featuring a chiral proline ring bearing a hydroxyl group in the side chain and a cis relationship that constrains ring geometry. The Fmoc group masks the amino functionality for controlled peptide coupling, while the free carboxylic acid enables C-terminal activation and incorporation into growing peptide chains. The stereochemical integrity at the D-center and the cis-hydroxyproline conformation can influence backbone turn propensity and local hydrogen-bonding patterns in peptide scaffolds. The side-chain hydroxyl participates in derivatization and can be protected or transformed to tune polarity, reactivity, and downstream conjugation chemistry.

1. Peptide Synthesis

Fmoc-D-cis-Hyp-OH is used in peptide building-block workflows for solid-phase peptide synthesis and related coupling strategies where Fmoc protection supports iterative N-terminal deprotection and re-coupling. The amino acid ester/amide-forming chemistry is enabled by the carboxylic acid functionality, while the Fmoc group provides orthogonal handling relative to side-chain functional transformations. The cis-hydroxyproline stereochemistry and D-configuration can be incorporated to generate peptide segments with defined turn structures and hydroxyl-mediated hydrogen-bonding motifs. The resulting protected amino acid derivative is suitable for constructing hydroxyproline-containing peptides, including cyclic or constrained motifs used in structural studies and peptidomimetic design.

2. Peptidomimetics And SAR Studies

Fmoc-D-cis-Hyp-OH is applied in peptidomimetic construction and structure-activity relationship studies where constrained proline geometry and side-chain hydroxyl functionality help model bioactive conformations. The cis-hydroxyproline ring can act as a conformational bias element, and the D-stereocenter supports access to stereochemically defined analog series for SAR investigations. The Fmoc group enables controlled incorporation into analog libraries, while the hydroxyl group can be left free for hydrogen-bonding or converted into protected forms to modulate polarity and reactivity during synthesis. Downstream derivatives prepared from this building block can serve as molecular probes, scaffold elements, or conformationally restricted analogs for mapping structure-function relationships.

3. Side-Chain Functionalization

Fmoc-D-cis-Hyp-OH supports amino acid derivatization strategies targeting the side-chain hydroxyl group for chemical biology and materials-facing conjugations. The free hydroxyl can be selectively protected, activated, or functionalized to introduce linkers, handle sites for bioconjugation, or enable further synthetic elaboration without disrupting the Fmoc-protected amine during early stages. The carboxylic acid allows conversion to activated intermediates or coupling partners when the compound is used as a chiral synthon for attaching hydroxyproline motifs to larger frameworks. The stereodefined cis-hydroxyproline scaffold can therefore be carried through multi-step sequences to generate functionalized amino acid derivatives and downstream conjugates with controlled spatial orientation.

4. Chemical Biology Probes

Fmoc-D-cis-Hyp-OH is utilized in chemical biology research to generate stereochemically defined hydroxyproline-containing peptides and conjugates for studying biomolecular recognition and conformational effects. The combination of Fmoc protection and a free carboxyl group supports incorporation into labeled or affinity-tagged constructs, while the hydroxyl group can contribute to specific hydrogen-bonding interactions relevant to binding-site engagement. The D-cis configuration can be leveraged to probe stereochemical sensitivity in peptide-protein or peptide-receptor interactions without altering the overall proline-derived scaffold. The resulting intermediates can be advanced into probe libraries, immobilized ligands, or chemically modified peptide reagents used to interrogate molecular interactions.

5. Pharmaceutical Intermediate Preparation

Fmoc-D-cis-Hyp-OH is suitable for process chemistry and fine chemical synthesis routes that require stereodefined, protected amino acid intermediates for manufacturing peptide-like building blocks. The Fmoc-protected amine supports robust handling under peptide synthesis conditions, while the carboxylic acid enables standardized activation to form amide linkages in downstream sequences. The cis-hydroxyproline stereochemistry and D-configuration provide a controllable chiral element that can be carried through to final drug-candidate-like intermediates, including constrained peptidomimetic fragments. The hydroxyl functional group can be protected or transformed as part of manufacturing-compatible protection-group strategies to manage chemoselectivity during scale-up.

6. Analytical Research Standards

Fmoc-D-cis-Hyp-OH can be employed as an analytical reference material and method-development intermediate for quantification and characterization of hydroxyproline-containing peptide fragments. The presence of a defined chiral D-center, cis ring geometry, and an Fmoc tag yields a reproducible molecular signature useful for chromatographic separation and mass-based identification of related derivatives. The hydroxyl-bearing side chain supports derivatization workflows when analytical methods require controlled polarity or derivatized detection targets. The compound's structure therefore enables consistent tracking of protected amino acid incorporation, deprotection outcomes, and stereochemical integrity in peptide synthesis and downstream analytical verification.

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