Fmoc-D-aspartic acid α-allyl ester is a protected amino acid derivative in which the aspartic acid backbone is rendered as a D-configured amino acid bearing an Fmoc (9H-fluoren-9-ylmethoxycarbonyl) group on the α-amino functionality and an α-allyl ester on the carboxyl group. The side chain contains a β-carboxyl group, which is available for further derivatization or coupling chemistry, while the allyl ester and Fmoc carbamate act as orthogonal protecting elements that control chemoselectivity during peptide-related synthesis. In synthetic workflows, the molecule is used as a building block for stepwise incorporation of aspartate residues into peptides via protected-amino-acid coupling strategies and as a precursor for generating aspartate derivatives after deprotection of the allyl ester when needed for subsequent functionalization or conjugation.
CAT No: CP00418
Fmoc-D-aspartic acid α-allyl ester is a D-configured aspartate derivative bearing an Fmoc-protected amino group and an allyl ester at the α-carboxyl position, providing a chiral amino acid ester suitable for protected amino acid synthesis and peptide coupling. The side chain contains a β-carboxyl functionality that can be managed through orthogonal protection or conversion, enabling controlled chemoselective transformations during peptide assembly and downstream derivatization. The allyl ester supports base-stable handling while enabling later deprotection or functional-group unveiling under conditions compatible with peptide chemistry, and the Fmoc carbamate enables N-terminal protection strategies via standard base-mediated removal. The D stereochemistry at the α-carbon supports stereochemically defined peptide and peptidomimetic construction, while the allyl handle can participate in orthogonal modifications such as alkene-based functionalization for synthetic intermediate generation.
1. Peptide Synthesis
Fmoc-D-aspartic acid α-allyl ester is applied in solid-phase and solution-phase peptide synthesis where an Fmoc-protected amino group enables iterative N-terminal coupling cycles with controlled deprotection of the carbamate. The α-allyl ester provides an ester-protected carboxyl functionality that can be retained during coupling steps and later converted to a free acid or alternative acyl form, supporting C-terminal or side-chain carboxyl management depending on the protection scheme used for the aspartate β-carboxyl. The D-aspartate stereocenter supports incorporation of stereodefined residues into peptide building blocks, including peptides designed to modulate backbone conformation and protease resistance. The allyl group further enables downstream functionalization of the carboxyl-derived fragment, supporting synthesis of peptide analogs and aspartate-containing scaffolds with tailored termini. The compound thus functions as a protected amino acid ester intermediate compatible with peptide coupling chemistry and stereocontrolled amino acid incorporation.
2. Side-Chain Functionalization
Fmoc-D-aspartic acid α-allyl ester is utilized for side-chain and terminus functionalization strategies in amino acid derivatization workflows, leveraging the allyl ester motif as a reactive handle for orthogonal transformations. The presence of an allyl ester allows chemoselective conversion to alternative carboxylic acid derivatives or activation states after peptide assembly, enabling C-terminal modification patterns that differ from standard aspartate acid building blocks. The Fmoc-protected amine supports selective exposure of the amino functionality when needed, while the D configuration maintains stereochemical fidelity for structure-function studies and peptidomimetic design. The aspartate framework, with its carboxyl-rich character, can be carried through coupling steps and then redirected into new functional groups through controlled deprotection and derivatization sequences. This makes the compound suitable for generating functionalized aspartate-containing intermediates used in peptide analog libraries and chemically defined biomolecule variants.
3. Peptidomimetics And SAR Studies
Fmoc-D-aspartic acid α-allyl ester supports peptidomimetic construction and structure-activity relationship studies by providing a stereodefined D-aspartate residue with an orthogonally manipulable carboxyl protecting group strategy. The Fmoc carbamate enables consistent N-protection during scaffold assembly, while the allyl ester can be converted into a free acid or activated derivative to tune ionic character and hydrogen-bonding patterns typical of aspartate-containing motifs. The D stereochemistry can be incorporated into peptide-like backbones to probe how inversion at the α-center affects conformational preferences, receptor binding geometry, and enzymatic recognition in SAR-oriented research. The allyl functionality also supports diversification routes that generate terminally modified analogs for fragment-based molecular design and medicinal chemistry follow-ups. The compound thereby serves as a chiral amino acid intermediate for building stereochemically defined peptidomimetic libraries and SAR-compatible analog series.
4. Bioconjugation Chemistry
Fmoc-D-aspartic acid α-allyl ester is relevant to bioconjugation chemistry workflows where protected amino acid esters are used to prepare defined peptide linkers and conjugation-ready fragments. The Fmoc-protected amine can be used to build controlled peptide segments that later undergo deprotection to expose reactive termini for coupling to biomolecules, including proteins, peptides, or polymer backbones. The allyl ester functionality can be transformed into a carboxylate or activated acyl form after assembly, enabling formation of amide or ester linkages under conditions compatible with biomolecule conjugation planning. The D-aspartate residue contributes stereochemical definition to linker architecture, which may influence stability toward enzymatic cleavage and the spatial arrangement of functional groups on the conjugate. The compound is therefore suitable as a protected amino acid building block for generating chemically defined conjugates and linker intermediates used in chemical biology research.
5. Pharmaceutical Intermediate Preparation
Fmoc-D-aspartic acid α-allyl ester is employed in pharmaceutical intermediate preparation and process chemistry contexts where protected amino acid derivatives are manufactured as feedstocks for downstream peptide-active ingredients and peptidomimetic intermediates. The Fmoc-protected amino group provides a robust N-protection strategy that can be removed on demand during manufacturing of peptide building blocks, supporting scalable synthesis of defined sequences. The α-allyl ester offers a handle for controlled conversion to carboxylic acid derivatives, enabling route design that separates ester handling from later activation steps while maintaining stereochemical integrity of the D-aspartate center. The aspartate scaffold's carboxyl functionality supports subsequent transformations into activated acyl species or salt forms used in intermediate preparation and formulation development. The compound thus functions as a chiral, protected amino acid ester intermediate that can be integrated into industrial synthesis of peptide-based and peptide-mimetic chemical entities.
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