Fmoc-alpha-Me-L-Ala(Pentynyl)-OH is an Fmoc-protected, α-methylated L-alanine derivative bearing a pentynyl substituent on the side chain, classifying it as a non-natural amino acid suitable for peptide chemistry. The molecule contains an Fmoc carbamate on the α-amino group and a free carboxylic acid, with the α-methyl substituent and the pentynyl (alkyne) side-chain functionality providing a hydrophobic backbone modification and a terminal alkyne handle for subsequent derivatization. In synthesis workflows, this protected amino acid is used as a building block for stepwise peptide assembly and for preparing alkyne-functional peptide or peptide-conjugate structures used in chemical biology and labeling strategies.
Fmoc-alpha-Me-L-Ala(Pentynyl)-OH is an Fmoc-protected, chiral alanine derivative bearing an alpha-methyl substituent and a side-chain pentynyl group, presented as a carboxylic acid for peptide chemistry. The stereogenic center at the alpha-position is configured as L, while the N-terminus is masked by the fluorenylmethoxycarbonyl (Fmoc) protecting group to control amide formation during solid-phase or solution-phase coupling. The propargyl-like pentynyl functionality introduces a terminal alkyne handle that can participate in click-style conjugations or selective functional group transformations without perturbing the peptide backbone. The combination of an acid terminus for activation and an orthogonally removable N-protection strategy makes the compound a practical chiral amino acid intermediate for building alkyne-bearing peptide segments and downstream modified analogs.
1. Peptide Synthesis
Fmoc-alpha-Me-L-Ala(Pentynyl)-OH supports peptide building workflows where an Fmoc-protected amino acid with a free carboxylic acid is required for controlled amide bond formation. The alpha-methyl substitution and L-configuration influence coupling geometry and can affect conformational preferences in the growing chain, while the terminal pentynyl side chain remains chemically addressable after incorporation. Fmoc removal under standard base conditions exposes the amino group for iterative coupling, enabling construction of alkyne-functional peptides suitable for post-synthetic diversification. The resulting alkyne-bearing peptide products can be carried forward to conjugation, labeling, or side-chain derivatization steps that rely on the terminal carbon-carbon triple bond.
2. Bioconjugation Chemistry
Fmoc-alpha-Me-L-Ala(Pentynyl)-OH functions as a precursor for bioconjugation-oriented molecular design because the pentynyl side chain provides a terminal alkyne for selective coupling strategies. The Fmoc-protected amino acid format enables incorporation into peptide scaffolds that later undergo orthogonal functionalization, including copper-catalyzed azide-alkyne cycloaddition or strain-promoted alkyne reactions depending on the downstream partner set. The alpha-methyl stereocenter and alanine backbone contribute defined stereochemical presentation of the alkyne-bearing side chain, which can improve reproducibility in labeling chemistries and molecular recognition studies. Downstream derivatives generated from the terminal alkyne can serve as handles for attaching probes, affinity tags, or biomolecule-reactive motifs while maintaining peptide-derived structural integrity.
3. Peptidomimetics And SAR Studies
Fmoc-alpha-Me-L-Ala(Pentynyl)-OH is suitable for peptidomimetic construction and structure-activity relationship studies where controlled stereochemistry and side-chain functionality are required. The alpha-methyl group and the L-amino acid framework can be used to modulate backbone sterics and local conformational bias, while the pentynyl substituent enables systematic variation through orthogonal transformations into diverse functional groups. Fmoc protection supports stepwise synthesis of analog series, and the terminal alkyne can be converted into triazoles, linkers, or other clickable moieties that facilitate comparative SAR mapping. The compound thereby supports generation of alkyne-tagged or alkyne-derived analogs used to correlate structural features with binding or functional readouts in biochemical research settings.
4. Protected Amino Acid Synthesis
Fmoc-alpha-Me-L-Ala(Pentynyl)-OH serves as a chiral building block in protected amino acid chemistry and intermediate preparation for laboratories and process development teams. The Fmoc carbamate masks the amine to suppress side reactions during activation of the carboxylic acid and during peptide coupling, while the terminal alkyne remains protected from peptide-manufacturing conditions that would otherwise compromise unprotected reactive groups. The presence of both N-protection (Fmoc) and a free acid enables straightforward conversion into activated species for coupling or into derivatives for further synthetic elaboration. The compound's defined stereochemistry at the alpha-position makes it a reliable chiral amino acid intermediate for producing stereochemically consistent alkyne-functional peptide segments and related fine chemicals.
5. Analytical Research Standards
Fmoc-alpha-Me-L-Ala(Pentynyl)-OH can be applied in analytical research as a structurally defined reference material for monitoring peptide synthesis, protecting-group behavior, and side-chain functional group integrity. The Fmoc group provides a characteristic chromophore for LC/UV tracking of deprotection and coupling steps, while the terminal pentynyl functionality enables orthogonal detection through derivatization reactions that transform the alkyne into spectroscopically or mass-tagged products. The alpha-methyl, L-configured alanine core yields predictable fragmentation patterns and retention behavior in MS-based assays, supporting method development for peptide workflows that include alkyne-bearing residues. Downstream conversion of the terminal alkyne into click-derived tags can further support targeted quantitation of incorporation efficiency and identification of positional or stereochemical impurities in peptide analog libraries.
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