Fmoc-D-Asp(OBzl)-OH

Fmoc-D-Asp(OBzl)-OH is an Fmoc-protected, D-configured aspartic acid benzyl ester derivative that functions as a chiral amino acid building block for peptide chemistry. The molecule contains an N-(9H-fluoren-9-ylmethoxycarbonyl) protecting group that masks the amino functionality for controlled coupling, while the side chain carboxyl is esterified as an OBzl group to regulate chemoselectivity during chain assembly. The stereogenic center at the α-carbon enforces D-configuration, and the benzyl ester introduces an aromatic handle that can be removed under hydrogenolysis to regenerate the side-chain carboxylic acid for subsequent derivatization. The combination of protected amine, protected side-chain acid, and carboxylic acid at the C-terminus yields a predictable reactivity profile compatible with standard protected amino acid synthesis and peptide coupling workflows.

1. Peptide Synthesis

Fmoc-D-Asp(OBzl)-OH is used in solid-phase peptide synthesis and solution-phase peptide coupling where orthogonal protection is required for aspartate-containing sequences. The Fmoc group supports base-labile deprotection to expose the N-terminus for iterative amide bond formation, while the D-configuration and benzyl-protected side-chain carboxyl help maintain stereochemical integrity and suppress undesired side reactions during coupling. The free C-terminal carboxylic acid participates in standard activation to form peptide bonds, and the OBzl ester preserves the side-chain functionality until the desired stage. Resulting Asp residues bearing controlled stereochemistry can be incorporated into peptides for structure-activity relationship studies, enzyme substrate mapping, and peptide analog generation.

2. Side-Chain Functionalization

Fmoc-D-Asp(OBzl)-OH is applied to amino acid derivatization workflows that require delayed unveiling of the aspartate side-chain carboxylic acid. The benzyl ester on the side chain provides a stable protecting-group strategy during peptide assembly, then can be converted to the free acid to enable downstream transformations such as salt formation, amide coupling, esterification, or side-chain conjugation. The D-configuration can be leveraged to probe stereochemical effects on molecular recognition, including altered conformational preferences and binding-site interactions. The resulting functionalized Asp-containing intermediates support generation of charged or linker-bearing peptide derivatives for chemical biology and materials-oriented scaffold construction.

3. Protected Amino Acids

Fmoc-D-Asp(OBzl)-OH serves as a protected amino acid intermediate for manufacturing routes that require orthogonally protected chiral building blocks. The Fmoc carbamate protects the α-amino group during synthesis and can be removed under controlled deprotection conditions to yield the reactive amine for peptide coupling, while the OBzl group provides chemoselective handling of the side-chain carboxyl functionality. The presence of both an Fmoc-protected nitrogen and a benzyl-protected side-chain acid supports stepwise synthesis planning, including preparation of defined peptide fragments and controlled introduction of acidic functionality. Downstream processing can include conversion to other protected forms, incorporation into longer sequences, or use as a standardized intermediate for fine chemical production of aspartate-rich peptide materials.

4. Chemical Biology Probes

Fmoc-D-Asp(OBzl)-OH is utilized in chemical biology research where D-aspartate motifs and orthogonally protected side chains enable controlled probe construction. The protected amine and protected side-chain carboxyl allow assembly of peptides or peptidomimetics that retain a specific spatial arrangement of the acidic functionality, which can be important for binding-site engagement and enzyme recognition studies. Side-chain deprotection and subsequent conjugation can be used to introduce labels, linkers, or reactive handles for immobilization and affinity capture workflows. Incorporation of D-configured aspartate into probe scaffolds supports stereochemical interrogation of protein interactions and facilitates generation of defined biomolecule-modifying reagents.

5. Peptidomimetics And SAR

Fmoc-D-Asp(OBzl)-OH is applied to peptidomimetic construction and structure-activity relationship studies where controlled placement of an aspartate side chain is required. The D-configuration and protected carboxyl groups support synthesis of analogs that mimic the charge distribution of native Asp while altering stereochemical geometry to tune receptor or enzyme compatibility. The benzyl ester strategy helps maintain side-chain integrity during iterative assembly, enabling later conversion to the free acid for coupling to additional functional groups or for incorporation into constrained analogs. Resulting Asp-containing peptidomimetics can be produced as defined fragments for SAR mapping, fragment-based molecular design, and comparative evaluation of stereochemical variants in applied medicinal chemistry workflows.

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