Fmoc-2,3-dehydroVal-OH

Fmoc-2,3-dehydroVal-OH is an Fmoc-protected, chiral dehydroamino acid derivative derived from valine, featuring an N-(9H-fluoren-9-ylmethoxycarbonyl) protecting group and a side chain consistent with valine substitution. The 2,3-dehydro motif introduces an alkene into the amino acid backbone, enabling stereochemically defined reactions at the unsaturated center while retaining the carboxylic acid functionality for peptide coupling. The molecule's combination of a protected amine, free acid, and conformationally constrained alkene supports orthogonal protection strategies and compatibility with standard peptide synthesis workflows. The unsaturation can participate in downstream functionalization or serve as a structural element in peptidomimetic scaffolds where backbone rigidity and defined geometry influence reactivity and molecular recognition.

1. Peptide Synthesis

Fmoc-2,3-dehydroVal-OH is used in peptide building and solid-phase peptide synthesis workflows where an Fmoc-protected amino acid with a free carboxylic acid is required for reliable amide bond formation. The Fmoc group enables controlled N-deprotection under base conditions, while the 2,3-dehydroVal backbone provides an alkene-bearing residue that can be incorporated as a constrained turn-forming or backbone-modulating element. The unsaturated backbone can be retained through coupling to generate peptides that later undergo selective post-assembly transformations, including alkene-directed derivatization. Peptide science applications include preparation of dehydrovaline-containing analogs for backbone effect studies and synthetic methodology development in peptide coupling chemistry.

2. Peptidomimetics And SAR Studies

Fmoc-2,3-dehydroVal-OH is suitable for peptidomimetic construction in structure-activity relationship studies where an unsaturated amino acid residue can mimic conformational preferences of bioactive peptide motifs. The alkene in the backbone introduces stereochemical and geometric constraints that may influence local secondary structure, protease susceptibility, and binding-site complementarity in peptide analogs. The Fmoc-protected amine supports stepwise assembly of analog series, enabling systematic variation of neighboring residues while keeping the dehydro motif constant. Downstream derivatization of the backbone alkene can further expand chemical space for SAR-focused molecular design and fragment-to-lead exploration.

3. Side-Chain Functionalization

Fmoc-2,3-dehydroVal-OH can serve as a chiral amino acid intermediate for side-chain and backbone functionalization strategies that exploit the reactive alkene within the 2,3-dehydro framework. The presence of a protected N-terminus and a carboxylic acid allows selective conversion into activated intermediates for incorporation into larger constructs or for controlled transformations prior to peptide assembly. The dehydro backbone can potentially undergo addition, cycloaddition, or selective alkene functionalization to introduce handles for further synthetic elaboration while maintaining stereochemical integrity at the chiral center. Resulting products can be used to generate functionalized peptide analogs, crosslinking-ready scaffolds, or chemically diversified intermediates for fine chemical synthesis.

4. Chemical Biology Probes

Fmoc-2,3-dehydroVal-OH is applied in chemical biology research to build peptide-based probes that incorporate a backbone alkene for subsequent labeling or reactivity tuning. The Fmoc-protected amine supports incorporation into peptides with defined N-terminus architecture, while the dehydro motif provides a chemically addressable site that can be transformed into conjugation-ready functionalities. The carboxylic acid enables coupling into larger biomolecule-targeting sequences, including affinity-tagged or receptor-binding peptide fragments used for mechanistic studies. Downstream conversion of the alkene into stable linkages or reactive moieties can support biomolecular interaction mapping and controlled probe generation consistent with amino acid derivative chemistry.

5. Pharmaceutical Manufacturing Intermediates

Fmoc-2,3-dehydroVal-OH is relevant to pharmaceutical manufacturing and process chemistry as a protected, chiral amino acid building block for producing dehydro-containing peptide intermediates used in industrial peptide synthesis campaigns. The Fmoc group provides a standardized protection handle for N-terminal management during multi-step assembly, while the free carboxylic acid supports activation and coupling under industrially scalable peptide coupling conditions. The dehydroVal backbone can be carried through manufacturing steps as a defined structural element, with later-stage transformations enabling controlled generation of final peptide analogs or advanced intermediates. Industrial utility includes preparation of consistent, stereochemically defined peptide fragments and upstream supply of amino acid derivatives for downstream synthetic manufacturing of peptide-based fine chemicals.

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