Fmoc-4-(7-hydroxy-4-coumarinyl)-Abu-OH

Fmoc-4-(7-hydroxy-4-coumarinyl)-Abu-OH is an Fmoc-protected, chiral amino acid derivative built on an Abu (α-aminobutyric acid) backbone, bearing a coumarinyl side chain at the 4-position. The molecule contains a carbamate-protected α-amino group (Fmoc), a free carboxylic acid for C-terminal compatibility, and a phenolic hydroxyl on the coumarin ring that can participate in hydrogen bonding, metal coordination, and selective derivatization. The coumarin chromophore provides strong UV/fluorescence-responsive functionality that can be leveraged as a reporter or binding motif during peptide and biomolecule construction. The stereodefined Abu center supports stereochemically controlled peptide incorporation, while the Fmoc group enables standard base-labile deprotection strategies in peptide synthesis workflows.

1. Peptide Synthesis

Fmoc-4-(7-hydroxy-4-coumarinyl)-Abu-OH is used as a fluorescent peptide building block in solid-phase peptide synthesis and related coupling workflows. The Fmoc carbamate protects the α-amino functionality during chain assembly, while the free carboxylic acid supports amide bond formation at the growing peptide terminus. The coumarinyl side chain at the Abu 4-position remains chemically addressable, and the 7-hydroxy group can be retained for spectroscopic readout or selectively modified for controlled reactivity. Incorporation of this chiral residue enables construction of peptide analogs with defined stereochemistry and an internal chromophore for monitoring synthesis, conformational studies, or binding assays.

2. Chemical Biology Probes

Fmoc-4-(7-hydroxy-4-coumarinyl)-Abu-OH is applied in chemical biology as a coumarin-bearing amino acid intermediate for probe generation and molecular recognition studies. The phenolic hydroxyl on the coumarin ring provides a functional handle for conjugation chemistry, including esterification, ether formation, or hydrogen-bonding-driven interactions with target-binding pockets. The protected amino acid format allows stepwise incorporation into peptide scaffolds, enabling site-specific placement of the reporter moiety without perturbing backbone coupling. Downstream derivatization of the coumarin functionality supports development of fluorescence- or UV-active biomolecular probes for tracking interactions, mapping binding interfaces, and generating structure-function datasets.

3. Bioconjugation Chemistry

Fmoc-4-(7-hydroxy-4-coumarinyl)-Abu-OH can serve as a substrate for bioconjugation workflows where a defined amino acid residue is required as a conjugation anchor. The Fmoc-protected amine and carboxylic acid functionality support controlled conversion into peptide-derived conjugates, while the coumarin phenol can be transformed into reactive derivatives compatible with coupling to amines, thiols, or activated nucleophiles. The chiral Abu stereocenter helps maintain consistent spatial presentation of the chromophore relative to the peptide backbone, which can influence conjugate recognition and labeling behavior. Resulting coumarin-functional conjugates can be used in labeling strategies for biomolecule tracking, assay development, and analytical monitoring of conjugate formation.

4. Peptidomimetics And SAR Studies

Fmoc-4-(7-hydroxy-4-coumarinyl)-Abu-OH is suitable for peptidomimetic construction and structure-activity relationship studies that require a stereodefined, side-chain-functional amino acid. The Abu scaffold provides a distinct backbone geometry, and the coumarinyl substituent introduces an aromatic heterocycle with a tunable phenolic group for interaction profiling. Fmoc protection supports incorporation into peptide-like frameworks, enabling systematic variation of coumarin placement and side-chain modification while keeping peptide coupling chemistry consistent. Downstream transformation of the 7-hydroxy group can support analog series generation for SAR mapping, including analogs designed for altered polarity, metal-binding behavior, or spectroscopic response.

5. Process Chemistry Intermediate

Fmoc-4-(7-hydroxy-4-coumarinyl)-Abu-OH is used as a manufacturing-relevant intermediate for producing coumarin-tagged amino acid derivatives and peptide building blocks at scale. The presence of an Fmoc-protected amine and a free carboxylic acid supports robust, standardized protection/deprotection logic and compatibility with common peptide coupling chemistries, which can simplify route design for fine chemical synthesis. The phenolic hydroxyl on the coumarin ring provides a predictable functional group for downstream derivatization steps, enabling conversion into protected or activated forms depending on the target product. The defined stereochemistry of the Abu residue supports reproducible incorporation into downstream peptide or peptidomimetic products used in research and industrial chemical manufacturing pipelines.

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