Fmoc-D-Homocitrulline

Fmoc-D-Homocitrulline is an Fmoc-protected D-amino acid derivative featuring a ureido-containing side chain characteristic of homocitrulline analogs, paired with a chiral center at the α-position. The molecule contains an N-(9H-fluoren-9-ylmethoxycarbonyl) protecting group on the amino functionality, a free carboxylate or carboxyl-reactive terminus depending on the supplied form, and a stereodefined D-configuration that can be carried through peptide assembly. The ureido/urea-like functionality supports hydrogen-bonding and can participate in selective coupling or post-coupling transformations, while the Fmoc group enables orthogonal protection logic compatible with standard base-labile deprotection strategies. As a peptide building block and chiral amino acid intermediate, Fmoc-D-Homocitrulline exhibits a functional group pattern suited to peptide coupling chemistry, side-chain derivatization, and downstream synthetic elaboration in both research and manufacturing contexts.

1. Peptide Synthesis

Fmoc-D-Homocitrulline serves as a protected amino acid building block for solid-phase peptide synthesis and solution-phase peptide coupling, where the Fmoc group controls the N-terminus during chain elongation. The ureido-bearing side chain provides a polar motif that can be incorporated into peptide sequences to tune hydrogen-bonding networks, while the D-stereocenter supports stereochemical encoding for D-amino acid-containing peptides and peptidomimetic scaffolds. The carboxyl functionality can be activated for amide bond formation under peptide coupling conditions, and the orthogonal Fmoc strategy allows iterative deprotection and coupling cycles without exposing the side-chain functionality prematurely. Incorporation of Fmoc-D-Homocitrulline into peptide libraries can generate sequence-defined analogs for structure-activity relationship studies and biochemical probe development.

2. Peptidomimetics And SAR

Fmoc-D-Homocitrulline is applied in peptidomimetic construction and SAR studies where D-amino acid incorporation and ureido side-chain functionality help modulate conformational preferences and intermolecular recognition. The protected amine and defined stereochemistry enable systematic variation of stereochemical patterns in analog series, supporting structure-function mapping of peptide-like binders and enzyme-interacting motifs. The ureido group can participate in hydrogen-bonding and may serve as a handle for further functional group transformation after peptide assembly, enabling generation of constrained or substituted analogs. Downstream use includes preparing analog panels for molecular design workflows that rely on amino acid derivatization and stereochemical control to interpret binding or activity trends.

3. Chemical Biology Probes

Fmoc-D-Homocitrulline can be utilized in chemical biology research to generate labeled or functionalized peptide probes that target biomolecular recognition through polar ureido interactions. The Fmoc-protected nitrogen supports controlled incorporation into peptide frameworks, while the ureido side chain can be leveraged for conjugation-compatible derivatization or for maintaining specific interaction geometries in probe sequences. D-configuration provides an additional stereochemical dimension that can improve resistance to proteolysis in peptide-based probes and can help distinguish stereospecific binding modes in mechanistic studies. The resulting D-ureido peptide constructs can be employed as biochemical research intermediates for assay development, affinity reagent generation, and molecular recognition investigations.

4. Side-Chain Functionalization

Fmoc-D-Homocitrulline supports side-chain functionalization strategies because the ureido/urea-like functionality provides a chemically addressable polar group for post-assembly modification. The Fmoc protection enables selective handling of the amino terminus during synthesis, while the side-chain can be retained for later conversion into substituted urea derivatives, crosslinking-capable motifs, or additional hydrogen-bonding patterns. The stereodefined D-alpha center helps preserve the intended 3D arrangement of the side chain relative to the peptide backbone, which is important for reproducible functional group placement in complex intermediates. Functionalized derivatives derived from Fmoc-D-Homocitrulline can be used as intermediates in synthetic organic chemistry and as building blocks for generating diversified peptide analogs and functional molecular scaffolds.

5. Pharmaceutical Intermediate Preparation

Fmoc-D-Homocitrulline is suitable for pharmaceutical intermediate preparation and process chemistry workflows that require chiral, protected amino acid inputs for controlled peptide and peptidomimetic manufacturing routes. The Fmoc group provides a widely used protection/deprotection handle that aligns with scalable peptide synthesis logic, while the D-stereochemistry supports the production of stereochemically defined D-amino acid-containing intermediates. The ureido side chain contributes strong polarity, which can influence purification behavior and downstream formulation compatibility for peptide-derived materials and intermediate solids. Use of Fmoc-D-Homocitrulline in industrial fine chemical synthesis can support the preparation of sequence-defined intermediates, enabling consistent feedstock generation for subsequent coupling steps and derivatization stages in applied product development.

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