Boc-L-Dab(Dde)-OH is a protected derivative of L-2,4-diaminobutyric acid (Dab), bearing an N-terminal Boc (tert-butoxycarbonyl) protecting group and a Dde (1-(4,4-dimethyl-2,6-dioxocyclohexylidene)ethyl) protecting group on the side-chain amino functionality. The molecule contains both a free carboxylic acid group and two protected amino groups, with the stereochemistry indicated as L at the α-carbon, enabling controlled chemoselectivity during stepwise peptide assembly. In peptide chemistry and solid-phase peptide synthesis workflows, this orthogonally protected amino acid is used as a building block to introduce a diamino side chain while allowing selective deprotection and subsequent functionalization for conjugation, crosslinking, or structure-activity studies.
CAT No: CP25255
CAS No:1263045-50-6
Synonyms/Alias:N-alpha-Boc-N-gamma-Dde-L-2,4-diaminobutyric acid;Boc-Dab(Dde)
Chemical Name:N-alpha-t-Butyloxycarbonyl-N-gamma-[1-(4,4-dimethyl-2,6-dioxocyclohex-1-ylidene)ethyl]-L-2,4-diaminobutyric acid
Boc-L-Dab(Dde)-OH is a protected amino acid derivative built on L-2,3-diaminobutyric acid (Dab) bearing a side-chain Dde protecting group, with a Boc group on the amino functionality. This orthogonally protected design is commonly used to control chemoselectivity during peptide assembly, enabling selective deprotection of the side-chain amine while maintaining stability of the backbone-protecting Boc group under standard peptide synthesis conditions. As a stereodefined, protected building block, it is particularly valued for constructing peptides that require site-specific functionalization at the Dab side chain.
1. Orthogonally Protected Peptide Building Block
Boc-L-Dab(Dde)-OH is used by peptide synthesis groups to incorporate a protected Dab residue into linear peptides where selective side-chain amine availability is required for downstream coupling steps. The Dde group on the side-chain amine provides orthogonality relative to the Boc protection strategy, allowing researchers to expose the Dab side-chain nitrogen at a chosen stage of synthesis while keeping the backbone-protecting group intact for controlled sequence assembly. This makes the reagent a practical choice for custom peptide manufacturing workflows that demand predictable chemoselectivity and stepwise installation of functional groups on the Dab side chain.
2. Side-Chain Functionalization Strategies
Boc-L-Dab(Dde)-OH supports workflows that require late-stage diversification of the Dab side chain after peptide backbone construction. After selective removal of the Dde protecting group, the liberated amine can be used for subsequent derivatization steps that install additional handles for conjugation chemistry, affinity tag attachment, or incorporation into modified peptide motifs. Peptide chemists often select this protected building block specifically because the side-chain protection pattern helps reduce undesired cross-reactivity during earlier coupling steps, improving the practicality of multi-step peptide modification campaigns.
3. Complex Peptide Library Synthesis
Boc-L-Dab(Dde)-OH is frequently applied in peptide library development where controlled access to the Dab side-chain amine is needed across many analogs. In parallel synthesis or iterative library workflows, the orthogonally protected format helps standardize how and when the reactive side-chain functionality is revealed, which is important for reproducible downstream functionalization and for minimizing byproducts associated with premature amine exposure. Researchers developing structure-activity relationship (SAR) panels or labeled/modified peptide variants use this building block to maintain consistent protection logic across diverse analogs while enabling systematic side-chain variation at the Dab position.
4. Pharmaceutical Intermediate Peptide Segments
Boc-L-Dab(Dde)-OH is also used in the preparation of protected peptide segments and advanced intermediates intended for further synthetic elaboration in medicinal chemistry programs. The protected Dab residue provides a defined, stereochemically controlled unit that can be carried through intermediate stages without uncontrolled side reactions from free amines, while still allowing later activation of the side-chain nitrogen when the intermediate is advanced toward the next coupling or derivatization step. This positioning is common in research settings where peptide-based scaffolds require modular assembly and where orthogonal deprotection enables clean continuation of the synthetic sequence.
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