Cbz-D-Homocitrulline

Cbz-D-Homocitrulline is a D-configured homocitrulline amino acid derivative bearing a carbobenzyloxy (Cbz) group on the amino functionality and a free carboxylic acid, providing a protected amino acid suitable for peptide chemistry. The extended side chain relative to citrulline introduces additional methylene units that influence conformational behavior and side-chain reactivity, while the ureido-bearing motif supports strong hydrogen-bonding and nucleophilic/derivatization chemistry under standard amide/urea functional group transformations. The Cbz protecting group is stable under many coupling conditions yet can be removed by hydrogenolysis, enabling controlled access to the D-amino stereocenter during sequential synthesis. The combination of a chiral center, a protected amine, and a carboxylic acid makes Cbz-D-Homocitrulline a practical chiral building block and downstream intermediate for amino acid derivatization and peptide analog construction.

1. Peptide Synthesis

Cbz-D-Homocitrulline is applied in peptide building and protected amino acid synthesis where stepwise coupling requires orthogonal functional group management. The Cbz-protected amino group and free carboxylic acid allow conversion into activated carboxyl derivatives for amide bond formation while maintaining the D stereocenter through the coupling and purification steps. The ureido-containing side chain can participate in hydrogen-bond networks that affect solubility and conformational preferences of the resulting peptide analogs. D-homocitrulline incorporation can be used to construct peptide sequences for biochemical research, including mapping how side-chain length and ureido functionality influence recognition and stability.

2. Unnatural Amino Acid Incorporation

Cbz-D-Homocitrulline serves as a chiral amino acid intermediate for installing an unnatural D-homocitrulline residue into synthetic peptides and peptidomimetics. The D configuration and protected amine support stereochemically defined incorporation during fragment assembly, while the ureido motif supports further functional group transformations such as selective derivatization or conversion to alternative urea/amide architectures. The extended side chain length relative to canonical citrulline can be leveraged to tune spatial presentation of hydrogen-bond donors and acceptors in molecular recognition studies. Downstream derivatives prepared from this building block can be used in structure-activity relationship studies and molecular design workflows targeting receptor binding, enzyme tolerance, or altered proteolytic processing.

3. Side-Chain Functionalization

Cbz-D-Homocitrulline is utilized for side-chain functionalization strategies that exploit the ureido functionality and the carboxylic acid for controlled derivatization. The protected amino group reduces competing reactivity during selective chemistry, enabling targeted modification of the ureido region to generate urea-linked conjugates, additional hydrogen-bonding patterns, or functional handles for subsequent coupling. The carboxylic acid can be transformed into ester or amide derivatives to modulate polarity and solubility for downstream conjugation chemistry and analytical standards. The resulting functionalized amino acid or peptide analog intermediates can support chemical biology studies where side-chain electronics and geometry are varied systematically.

4. Bioconjugation Chemistry

Cbz-D-Homocitrulline is suitable for bioconjugation-oriented intermediate preparation where ureido and carboxyl functionalities can be incorporated into linker-bearing molecules. The Cbz-protected amine provides a protected state for controlled activation of the carboxyl group toward conjugation to amide-forming partners, while maintaining stereochemical integrity of the D amino center. The ureido group can serve as a hydrogen-bonding element within conjugates, potentially improving aqueous compatibility and affecting how conjugates interact with biomolecular surfaces. Conjugate-ready derivatives prepared from Cbz-D-Homocitrulline can be used for biomolecule labeling, affinity reagent construction, and analytical probe synthesis in biochemical research settings.

5. Process Chemistry Intermediate

Cbz-D-Homocitrulline is relevant to process chemistry and specialty chemical production as a chiral, protected amino acid intermediate that aligns with scalable protecting-group strategies. The Cbz group provides a robust amine protection handle compatible with common peptide-coupling activation chemistries, while the free carboxylic acid enables conversion into activated intermediates for further manufacturing steps. The presence of a single stereocenter and a defined functional group set supports reproducible downstream transformations such as controlled deprotection and sequential coupling or derivatization. Industrially, this makes Cbz-D-Homocitrulline a practical intermediate for producing D-homocitrulline-containing peptide building blocks and peptidomimetic fragments used in fine chemical synthesis and applied biochemical reagent manufacturing.

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