H-4-(7-Hydroxy-4-coumarinyl)-Abu-OH

H-4-(7-Hydroxy-4-coumarinyl)-Abu-OH is a chiral amino acid derivative built on an Abu (α-aminobutyric acid) backbone, bearing a coumarin chromophore at the 4-position of the side chain. The molecule contains a free carboxylic acid (-CO2H) and a primary amino group (-NH2), along with a phenolic 7-hydroxy substituent on the coumarin ring that can participate in hydrogen bonding and metal coordination. The coumarin scaffold provides a rigid, conjugated aromatic system suited to fluorescence-based detection, photophysical studies, and chromophore-tagged molecular probes. The stereogenic center of the Abu unit enables stereochemically defined amino acid incorporation, while the phenolic and carboxylic functionalities allow standard protecting-group strategies to control chemoselective peptide coupling and subsequent deprotection steps.

1. Fluorescent Peptide Probes

H-4-(7-Hydroxy-4-coumarinyl)-Abu-OH is applied in chemical biology and peptide science for constructing coumarin-tagged peptide probes used in binding studies and fluorescence readouts. The amino acid backbone supports peptide coupling through the α-amino and α-carboxyl functionalities, while the coumarin ring at the 4-position acts as a built-in reporter that can be tracked without introducing additional chromophore handles. Phenolic 7-hydroxy enables probe designs that can be tuned by protection/deprotection or by derivatization to modulate photophysical behavior and intermolecular interactions. Downstream, the resulting labeled peptides can serve as assay reagents, scaffold components for receptor/ligand interaction mapping, and standards for fluorescence-compatible analytical workflows.

2. Protected Amino Acid Synthesis

H-4-(7-Hydroxy-4-coumarinyl)-Abu-OH is suitable for protected amino acid chemistry where selective masking of the free amino and carboxylic acid groups is required for peptide building block preparation. The presence of both a primary amine and a carboxylic acid supports common orthogonal protection strategies that enable controlled peptide coupling while minimizing side reactions involving the coumarin phenol. The 7-hydroxy group can be managed through phenol-compatible protecting groups to preserve chromophore integrity during coupling and to allow later deprotection to regenerate the hydroxy functionality. The protected derivative forms can be carried into stepwise peptide assembly and can also function as intermediates for generating C-terminal or side-chain modified amino acid units in synthetic organic chemistry.

3. Peptide Coupling Chemistry

H-4-(7-Hydroxy-4-coumarinyl)-Abu-OH is used in peptide synthesis workflows that require incorporation of a defined chiral amino acid residue bearing a conjugated aromatic side chain. The Abu α-amino and α-carboxyl groups participate in standard amide bond formation, and the coumarin substituent provides a stable aromatic handle that withstands typical peptide coupling conditions when appropriately protected. Stereochemical control at the Abu center allows preparation of stereodefined peptide analogs for structure-function studies and for generating consistent probe behavior across synthetic series. The resulting peptidic products can be further functionalized at the phenolic position for conjugation chemistry or can be used directly as chromophore-bearing residues in peptide libraries and SAR-oriented scaffold exploration.

4. Bioconjugation And Labeling

H-4-(7-Hydroxy-4-coumarinyl)-Abu-OH is applied in bioconjugation chemistry for preparing coumarin-containing conjugates that can be attached to biomolecules through peptide or linker-based strategies. The coumarin phenolic 7-hydroxy can be converted into derivatized forms that enable chemoselective coupling to activated linkers, while the amino acid framework supports incorporation into peptides that act as conjugation carriers. The free acid and amine functionality also support intermediate formation for downstream attachment to solid supports or to bifunctional scaffolds used in labeling workflows. The stereodefined Abu residue can influence conjugate conformation, which may be relevant when designing labeled peptides, affinity probes, or analytical reagents that require reproducible molecular geometry.

5. Process Chemistry Intermediate

H-4-(7-Hydroxy-4-coumarinyl)-Abu-OH serves as a chiral process chemistry intermediate for manufacturing coumarin-tagged amino acid derivatives and peptide-building blocks on scalable synthetic routes. The molecule's functional group set enables stepwise protection, activation, and coupling sequences that map cleanly onto industrially practiced intermediate handling, including isolation of protected forms and controlled deprotection to restore the phenolic 7-hydroxy group. The conjugated coumarin system provides a robust structural motif that can be carried through multistep synthesis with attention to chemoselectivity at the phenol during activation and coupling. The resulting downstream intermediates can feed fine chemical production of fluorescent standards, labeled peptide reagents, and research-grade amino acid derivatives used across peptide manufacturing and analytical chemistry supply chains.

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