Fmoc-D-homoleucine is a protected amino acid derivative in which the amino group of D-homoleucine is protected with an Fmoc (9H-fluoren-9-ylmethoxycarbonyl) group, while the molecule retains the free carboxylic acid functionality and the characteristic branched hydrophobic side chain of homoleucine. The stereochemical configuration is specified as D, and the side chain is a saturated alkyl group that bears no additional reactive heteroatoms beyond the backbone amine (protected) and carboxyl group. As an Fmoc-protected building block, it is used for stepwise peptide synthesis, including solid-phase peptide synthesis, where the Fmoc group controls chemoselectivity during chain assembly and the free carboxyl group enables peptide bond formation with incoming amino components.
CAT No: CP06504
Fmoc-D-homoleucine is a D-configured homologue of leucine bearing an extended aliphatic side chain and an N-(9H-fluoren-9-ylmethoxycarbonyl) (Fmoc) protecting group on the amino functionality. The molecule contains a stereogenic α-carbon that enforces D-stereochemistry, along with a carboxylic acid suitable for amide bond formation after activation. The Fmoc group provides orthogonal protection under standard peptide-synthesis conditions, while the unprotected carboxylate participates in coupling chemistry and can be converted to activated intermediates. The combination of a chiral, side-chain-rich hydrophobic scaffold and a removable N-protecting group makes Fmoc-D-homoleucine a practical chiral amino acid building block for controlled peptide assembly and downstream derivatization.
1. Peptide Synthesis
Fmoc-D-homoleucine is used in automated and manual peptide synthesis where D-amino acid incorporation supports stereochemically defined peptide backbones. The Fmoc-protected amine enables base-labile deprotection to generate a reactive N-terminus for peptide coupling, while the carboxylic acid engages in standard activation to form amide linkages. The D-configuration and homoleucine side chain length influence conformational preferences and hydrophobic packing, which can be important when constructing peptide segments with altered stability or recognition profiles. The resulting peptidic products can be extended at either terminus using compatible protecting-group strategies, supporting iterative assembly of peptide building blocks and analog libraries.
2. Unnatural Amino Acid Incorporation
Fmoc-D-homoleucine is applicable to chemical biology workflows requiring unnatural amino acid substitution to probe structure-function relationships in peptide and protein contexts. The chiral D-center and hydrophobic side chain can be introduced at specific positions to modulate local geometry, backbone torsion angles, and steric environment without changing the overall amino acid count. The Fmoc group supports stepwise synthesis of defined sequences, while the carboxyl functionality allows conversion into peptide bonds or protected derivatives for selective downstream transformations. The D-homoleucine residue can serve as a stereochemical handle for generating peptidomimetic scaffolds, enabling systematic comparison of L- versus D-substituted analogs in applied research and fine chemical synthesis.
3. SAR Studies
Fmoc-D-homoleucine is suitable for structure-activity relationship studies in medicinal chemistry and peptidomimetic design where position-specific stereochemical variation is required. The extended aliphatic side chain and D-stereochemistry can be leveraged to tune hydrophobic surface area and side-chain orientation, parameters often correlated with binding-site complementarity in lead optimization campaigns. The Fmoc-protected amine supports consistent peptide coupling chemistry across analog series, enabling parallel synthesis of multiple stereoisomeric or sequence-defined variants. The resulting D-homoleucine-containing analogs can be used as defined chemical entities for SAR mapping, supporting iterative scaffold refinement and downstream analytical characterization.
4. Pharmaceutical Manufacturing
Fmoc-D-homoleucine is used as a chiral amino acid intermediate in the manufacturing supply chain for Fmoc-based peptide ingredients and peptide intermediates. The Fmoc-protected amino acid format aligns with established process chemistry for protected amino acid handling, including controlled deprotection and coupling steps that generate peptide-grade intermediates. The stereogenic D-center provides a defined stereochemical outcome for D-amino acid-containing sequences, which is relevant for producing stereochemically consistent peptide materials. The carboxylic acid functionality supports conversion into activated species during manufacturing operations, enabling incorporation into larger peptide structures used in specialty chemical production and industrial peptide manufacturing.
5. Side-Chain Functionalization
Fmoc-D-homoleucine can serve as a precursor for side-chain functionalization strategies that convert the hydrophobic aliphatic residue into chemically differentiated analogs. The protected amine and carboxyl group allow the amino acid to be incorporated into peptide frameworks before selective modifications, reducing undesired reactivity during upstream synthesis. The homoleucine side chain can be used as a platform for derivatization routes that introduce additional functional groups after peptide assembly or at intermediate stages, supporting conjugation-ready or assay-compatible derivatives. The ability to maintain D-stereochemistry while enabling chemical diversification supports generation of functional peptide analogs for chemical biology, materials-oriented peptide constructs, and applied synthetic methodology development.
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