Fmoc-(3S,4S)Sta-OH

Fmoc-(3S,4S)Sta-OH is an Fmoc-protected, stereochemically defined amino acid derivative built on the Sta (statine) side-chain framework, bearing two contiguous stereocenters at C3 and C4. The molecule contains a carbamate-linked Fmoc group on the amino functionality and a free carboxylic acid for controlled C-terminal participation in peptide coupling. The constrained, hydrophobic side chain and the presence of the chiral hydroxyl-bearing motif typical of statine-like architectures support conformational bias and predictable stereochemical outcomes during amide bond formation. The protected amine and unprotected acid enable orthogonal handling in solid-phase or solution-phase peptide building while allowing downstream side-chain transformations into additional functional motifs relevant to peptidomimetic and enzyme-binding studies.

1. Peptide Synthesis

Fmoc-(3S,4S)Sta-OH serves as a peptide building block for stepwise assembly of statine-containing sequences in protected amino acid synthesis workflows. The Fmoc carbamate supports standard base-labile deprotection strategies, exposing the stereodefined amine for coupling while the free carboxylic acid participates as the C-terminal reactive handle. The (3S,4S) stereochemical configuration helps encode a defined three-dimensional side-chain topology that can influence amide bond geometry and local conformational preferences in the growing peptide. The resulting statine analog peptides can be used to probe binding modes, generate constrained peptide scaffolds, and support systematic derivatization at the side chain for structure-activity relationship studies in peptide chemistry.

2. Peptidomimetics And SAR

Fmoc-(3S,4S)Sta-OH is suitable for peptidomimetic construction where a statine-like residue provides conformational restriction and side-chain functionality for receptor or enzyme interface mapping. The chiral centers at C3 and C4, combined with the Fmoc-protected amino group and free acid, enable incorporation into analog libraries through repeatable peptide coupling chemistry followed by controlled deprotection and functional-group editing. The resulting peptidomimetic frameworks can be applied to SAR studies by varying adjacent residues, side-chain substituents, or terminal modifications while maintaining the stereochemical identity of the statine motif. Downstream derivatives generated from the statine scaffold can include chemically diversified analogs for fragment-to-lead optimization and mechanistic studies in biochemical research.

3. Enzyme Substrate Design

Fmoc-(3S,4S)Sta-OH can be employed in enzyme studies that require stereochemically defined amino acid analogs resembling substrate transition-state features. The protected amine and free carboxyl group allow installation into peptide-like inhibitors or substrate mimics where the (3S,4S) configuration governs how the side chain projects into enzyme active-site pockets. The constrained statine architecture can be leveraged to tune hydrogen-bonding patterns and steric presentation, supporting rational design of inhibitor scaffolds that undergo further derivatization for binding assays or mechanistic probing. The compound's compatibility with peptide synthesis strategies also supports generation of series of analogs for comparative biochemical characterization and mechanistic interpretation.

4. Protected Amino Acid Chemistry

Fmoc-(3S,4S)Sta-OH functions as an Fmoc-protected chiral amino acid intermediate for orthogonal protection schemes and controlled intermediate preparation in synthetic organic chemistry. The Fmoc group provides a stable N-protection handle during coupling and purification steps, while the free carboxylic acid enables selective activation for amide formation or conversion into other activated derivatives for downstream chemistry. The defined (3S,4S) stereochemistry supports stereochemical integrity through synthetic sequences that may include coupling, purification, and temporary functional group transformations. The compound can be used to prepare additional protected or activated statine derivatives, including intermediates for C-terminal modification, side-chain functionalization, and generation of analogs used in fine chemical synthesis.

5. Pharmaceutical Manufacturing Intermediates

Fmoc-(3S,4S)Sta-OH is applicable to industrial fine chemical synthesis and pharmaceutical intermediate preparation where reproducible stereochemical building blocks are required for peptide-like structures. The Fmoc-protected amine and free acid format supports scalable peptide coupling strategies and downstream conversion into activated intermediates suitable for controlled manufacturing routes. The stereochemically defined statine scaffold can be incorporated into processable sequences that later undergo deprotection and further functional transformations to reach target intermediate forms used in manufacturing of peptide-derived materials. The compound's structural features align with industrial needs for chiral consistency across batches, enabling reliable construction of stereodefined amino acid derivatives for downstream synthetic steps.

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