Fmoc-Asp(OtBu)-(Dmb)Gly-OH

Fmoc-Asp(OtBu)-(Dmb)Gly-OH is a chiral, Fmoc-protected aspartic acid-derived peptide building block featuring an Fmoc carbamate on the amino terminus and an aspartate side-chain protected as tert-butyl ester (Asp(OtBu)). The molecule also contains a glycine residue bearing an N-(Dmb) protecting group (Dmb = 2,2-dimethylbenzhydryl), producing a sterically shielded amide-forming handle for controlled peptide coupling. The presence of two orthogonally protected functional groups enables selective deprotection sequences, while the carboxylic acid at the C-terminus (Gly-OH) remains available for activation and coupling. The combination of Fmoc stability under base and Dmb/OtBu lability under specific cleavage conditions supports stepwise synthesis of Asp-Gly motifs and related protected amino acid intermediates for peptide and peptidomimetic construction.

1. Peptide Synthesis

Fmoc-Asp(OtBu)-(Dmb)Gly-OH is applied in automated and manual peptide synthesis workflows where Asp-Gly connectivity and orthogonal protection are required. The Fmoc group supports standard base-mediated N-deprotection, while the Asp(OtBu) ester and the Dmb-protected glycine nitrogen provide orthogonal protection to manage side-chain and amine reactivity during sequential couplings. The free C-terminal carboxylic acid enables activation to form amide bonds with incoming amino components, supporting incorporation into longer peptide chains with controlled stereochemical outcomes at the Asp center. Downstream, the protected block can be converted into Asp-Gly-containing peptides used as research scaffolds, reference materials, and synthesis intermediates for peptide analog generation.

2. Chemical Biology

Fmoc-Asp(OtBu)-(Dmb)Gly-OH serves as a defined amino acid derivative for chemical biology studies that require incorporation of protected acidic residues into functional peptide probes. The aspartate side-chain functionality, masked as OtBu during synthesis, can be unveiled to generate a carboxylate-bearing motif that participates in electrostatic interactions, metal coordination, or pH-dependent conformational effects in peptide constructs. The Dmb-protected glycine nitrogen allows controlled unveiling of the amide-forming site after assembly, supporting the preparation of peptides used for binding assays, substrate mimicry, and mechanistic probe design. The resulting peptides can be further derivatized into conjugation-ready intermediates for studying protein recognition and biomolecular interactions.

3. Bioconjugation Chemistry

Fmoc-Asp(OtBu)-(Dmb)Gly-OH can be used to prepare conjugatable peptide segments where a protected Asp-Gly unit is required as a linker element. The Fmoc-protected N-terminus and orthogonally protected side-chain carboxylate enable peptide chain assembly without premature exposure of reactive acidic or amine functionalities that could interfere with coupling or labeling steps. After deprotection, the regenerated carboxylate and peptide backbone amide groups can be leveraged for downstream transformations such as activation for coupling to amines, incorporation into affinity tags, or attachment to biomolecule scaffolds through established linker chemistries. This makes the compound suitable for producing well-defined bioconjugation intermediates and analytical standards used in labeling and characterization workflows.

4. Peptidomimetics And SAR Studies

Fmoc-Asp(OtBu)-(Dmb)Gly-OH supports peptidomimetic construction and structure-activity relationship (SAR) studies by providing a protected, stereochemically defined acidic dipeptide fragment. The Asp(OtBu) and Dmb protections allow chemists to introduce the Asp-Gly motif into analog libraries while maintaining compatibility with peptide coupling conditions and minimizing side reactions from free carboxylate or amine groups. Selective deprotection strategies can reveal the Asp side-chain carboxylate to tune hydrogen-bonding patterns and charge distribution, which are common determinants in binding-site recognition. Assembled analogs derived from this building block can be used as SAR probes, enabling systematic evaluation of how Asp-Gly geometry and functional group presentation influence molecular recognition.

5. Pharmaceutical Manufacturing Intermediates

Fmoc-Asp(OtBu)-(Dmb)Gly-OH is relevant to pharmaceutical manufacturing and process chemistry as a protected amino acid intermediate used to build defined peptide components and peptide-derived intermediates. The orthogonal protection scheme, featuring Fmoc for controlled N-deprotection and acid/amine masking via OtBu and Dmb, supports manufacturing-friendly stepwise assembly where reactive groups are managed to reduce impurities from uncontrolled side reactions. The free C-terminal carboxylic acid facilitates consistent coupling chemistry to upstream and downstream building blocks, aligning with scalable synthetic planning for peptide intermediates. Downstream, the material can be incorporated into larger peptide sequences that serve as process intermediates for active pharmaceutical ingredient (API) synthesis routes and for generating characterization batches in applied peptide production settings.

1. Low bone turnover and low BMD in Down syndrome: effect of intermittent PTH treatment

2. Immune responses to homocitrulline-and citrulline-containing peptides in rheumatoid arthritis

3. Genetic, cellular, and structural characterization of the membrane potential-dependent cell-penetrating peptide translocation pore

4. Autoinhibition and phosphorylation-induced activation of phospholipase C-γ isozymes

5. cRGD-functionalized, DOX-conjugated, and 64Cu-labeled superparamagnetic iron oxide nanoparticles for targeted anticancer drug delivery and PET/MR imaging