Boc-Asp(OAll)-OH is a protected amino acid derivative of aspartic acid featuring an N-terminal Boc (tert-butoxycarbonyl) carbamate and a side-chain OAll group where the β-carboxyl is protected as an Alloc (allyloxycarbonyl) ester. The molecule contains both the α-amino functionality masked as a Boc carbamate and the α-carboxylic acid as a free acid, with the side chain presenting an esterified carboxyl that bears an allyl-based protecting group for chemoselective transformations. In peptide synthesis workflows, this orthogonally protected Asp analogue is used as a building block to control reactivity of the amine and side-chain carboxyl during stepwise assembly and to support selective deprotection strategies for generating the corresponding functionalized Asp residue.
CAT No: CP00409
Boc-Asp(OAll)-OH is a protected aspartic acid derivative designed for peptide synthesis workflows, featuring a Boc-protected amino group and an OAll-protected side-chain carboxylate on the Asp residue. The aspartate side chain is therefore masked as an allyl ester (OAll), enabling controlled deprotection strategies during assembly of peptide segments. This reagent is commonly selected when downstream coupling requires a stable, orthogonal side-chain protecting group that can be removed under conditions compatible with other protecting groups used in complex peptide targets.
1. Solid-Phase Peptide Synthesis
Boc-Asp(OAll)-OH is used by peptide chemistry groups to incorporate an Asp residue bearing a protected side-chain carboxylate into peptide sequences during solid-phase peptide synthesis. The Boc group supports standard N-protection logic for N-terminal chemistry, while the OAll allyl ester on the side-chain carboxylate helps prevent side reactions such as undesired acylation or salt formation during chain assembly. Researchers preparing Asp-containing peptides for structure-activity relationship studies, peptide library construction, and sequence optimization often choose this specific protecting-group pattern to manage aspartate reactivity while keeping the side-chain available for later selective deprotection and subsequent functionalization.
2. Aspartate Side-Chain Deprotection
Boc-Asp(OAll)-OH is frequently selected as a segment building block when the development plan requires controlled unveiling of the Asp side-chain carboxyl group after peptide assembly. The allyl ester (OAll) protection provides a practical handle for downstream conversion of the Asp side chain into a free carboxylate for salt formation, coupling to activatable groups, or attachment of linkers used in peptide conjugation workflows. In medicinal chemistry and chemical biology settings, this enables route planning where the peptide is assembled with the side chain masked, then the Asp functionality is revealed at a stage that minimizes side reactions and improves overall synthetic efficiency for complex, multifunctional peptide constructs.
3. Peptide Conjugation Linker Building
Boc-Asp(OAll)-OH is applied in workflows that generate Asp-functionalized peptides for conjugation and materials-oriented peptide engineering, where the side-chain carboxylate serves as a key attachment point. After peptide synthesis and selective side-chain deprotection, the Asp carboxyl group can be used to form amide or ester linkages with activated derivatives, supporting the preparation of peptide conjugates used as research reagents, immobilization motifs, or building blocks for biomaterial surface functionalization. Teams developing targeted probes, immobilized peptide ligands, and modular peptide constructs often rely on this protected Asp form to ensure that the reactive side-chain functionality is introduced only when the conjugation step is executed, improving compatibility with other functional groups present in the same peptide.
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