Fmoc-11-Aun-OH

Fmoc-11-Aun-OH is an Fmoc-protected, amino acid-derived building block featuring a chiral amino acid backbone terminated by a carboxylic acid and a side chain bearing an alkyne functionality with an 11-carbon chain length. The N-fluorenylmethoxycarbonyl (Fmoc) group provides base-labile protection of the amino functionality, enabling iterative solid-phase or solution-phase peptide coupling while preserving stereochemical integrity at the chiral center. The free carboxylic acid supports amide bond formation under standard coupling conditions, while the terminal alkyne can participate in downstream functionalization reactions such as cycloaddition or selective oxidation to introduce additional handles for conjugation and scaffold elaboration. The combination of protected amine, reactive acid, and latent side-chain reactivity makes Fmoc-11-Aun-OH a practical chiral intermediate for peptide science and synthetic organic chemistry workflows requiring orthogonal functional group management.

1. Peptide Synthesis

Fmoc-11-Aun-OH is used in peptide synthesis workflows where Fmoc chemistry enables controlled N-terminal protection and stepwise chain assembly. The protected amine and carboxylic acid functionality support peptide coupling to neighboring residues, while the stereogenic center aligns with stereochemically defined peptide analog construction. The alkyne-bearing side chain remains masked from peptide coupling conditions yet can be carried forward for post-assembly derivatization, supporting late-stage functionalization strategies. Resulting alkyne-containing peptide products can serve as probes for binding studies, crosslinking-compatible scaffolds, or precursors for further chemical diversification, linking amino acid structure to peptide-level reactivity.

2. Side-Chain Functionalization

Fmoc-11-Aun-OH is applicable to side-chain functionalization in synthetic organic chemistry and chemical biology, leveraging the terminal alkyne as a programmable chemical handle. The Fmoc-protected amino acid derivative allows selective deprotection to reveal a coupling-ready amine, then enables conversion of the alkyne into new functional motifs through orthogonal transformations. The long aliphatic spacer and alkyne positioning can influence accessibility and local reactivity, which is relevant when designing molecular recognition elements or conjugation-ready intermediates. Downstream products may include cycloaddition-derived conjugates, oxidized alkyne derivatives, or further elaborated peptidomimetic fragments that retain the chiral amino acid stereochemistry.

3. Bioconjugation Chemistry

Fmoc-11-Aun-OH can be employed in bioconjugation chemistry to prepare alkyne-bearing peptide or protein-reactive intermediates for labeling and functional mapping. The Fmoc-protected N-terminus supports incorporation into peptide sequences, while the alkyne side chain provides a chemically addressable site for conjugation reactions that proceed under conditions compatible with biomolecule handling. The carboxylic acid enables formation of amide-linked constructs that can be used as linkers, affinity tags, or modular segments in conjugate synthesis. The resulting alkyne-functional biomolecular conjugates can be used as analytical reagents or as building blocks for multicomponent labeling strategies in biochemical research.

4. Peptidomimetics And SAR Studies

Fmoc-11-Aun-OH is suitable for peptidomimetic construction and structure-activity relationship (SAR) studies where controlled stereochemistry and tunable side-chain length are required. The amino acid backbone provides a defined chiral center and an amide-forming carboxyl group, supporting incorporation into analog libraries that probe how spatial presentation affects binding or function. The alkyne side chain can act as a modular substituent that enables rapid diversification into chemically distinct analogs without changing the core stereochemical scaffold. Synthesized analogs can serve as research intermediates for fragment-based molecular design, enabling systematic exploration of side-chain effects on molecular recognition.

5. Pharmaceutical Manufacturing Intermediates

Fmoc-11-Aun-OH is relevant to pharmaceutical manufacturing and process chemistry as a protected amino acid intermediate used to build defined peptide segments and peptidomimetic motifs. The Fmoc group provides a robust protection strategy for the amino functionality during synthesis and can be removed under base conditions to expose the reactive amine for subsequent coupling steps. The presence of a free carboxylic acid supports incorporation into larger intermediates through standard peptide bond formation logic, while the alkyne side chain offers a controlled functional handle for later conversion during downstream processing. Process routes can therefore treat Fmoc-11-Aun-OH as a chiral, functionalized building block that enables consistent intermediate generation for specialty chemical production and controlled scaffold assembly.

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