Boc-L-Dap(Dde)-OH is a protected, amino acid derivative in which L-2,3-diaminopropanoic acid (L-Dap) is furnished with a Boc (tert-butoxycarbonyl) group on the α-amino functionality and an additional Dde (1-(4,4-dimethyl-2,6-dioxocyclohexylidene)ethyl) protecting group on one of the side-chain amino groups. The molecule contains both an α-carboxylic acid and protected amino groups, and the Dde group provides acid-stable protection that can be removed under conditions commonly used in stepwise peptide synthesis while preserving the Boc group. Boc-L-Dap(Dde)-OH is used as a building block for preparing peptides and peptidomimetics via controlled chemoselective deprotection and subsequent coupling, including applications where orthogonal side-chain deprotection is required to install functionalized residues or linkers.
CAT No: CP25253
CAS No:1263045-09-5
Synonyms/Alias:N-alpha-Boc-N-beta-Dde-L-2,3-diaminopropionic acid;Boc-Dap(Dde);Boc-Dpr(Dde)-OH;Boc-Dapa(Dde)-OH
Chemical Name:N-alpha-t-Butyloxycarbonyl-N-beta-[1-(4,4-dimethyl-2,6-dioxocyclohex-1-ylidene)ethyl]-L-2,3-diaminopropionic acid
Boc-L-Dap(Dde)-OH is a Boc-protected, side-chain-protected amino acid building block derived from L-2,3-diaminopropanoic acid (Dap), bearing an acid-labile Dde protecting group on one of the side-chain amino functions. The combination of Boc on the alpha-amino group with Dde on the side chain is widely used to enable orthogonal, stepwise functionalization during peptide assembly, particularly when controlled chemoselectivity at the side-chain amines is required. As a protected amino acid, it is primarily supplied for peptide and peptidomimetic synthesis workflows rather than direct biological use.
1. Orthogonal Peptide Assembly
Boc-L-Dap(Dde)-OH is used as a protected amino acid building block for constructing peptides that require selective side-chain amine manipulation, especially in sequences where one Dap amino group must be revealed while the other remains masked. Researchers performing solid-phase peptide synthesis rely on the Boc/Dde protection pattern to support controlled coupling and subsequent selective deprotection steps, enabling downstream attachment of guanidinium-like motifs, amide-forming modifications, or further derivatization at the Dap side chain. This reagent is a common choice for custom peptide synthesis where chemoselective handling of diamino side chains is essential to avoid cross-reactions and to improve sequence fidelity.
2. Peptidomimetic Linker Development
Boc-L-Dap(Dde)-OH is frequently incorporated into peptidomimetic and scaffold-building programs that use Dap as a functional spacer or as a handle for later conjugation. Medicinal chemistry and chemical biology groups employ this building block to introduce a protected diamine unit that can be transformed into a site-specific attachment point for neighboring fragments, such as amide linkages or further amine-based coupling partners. The orthogonal Boc/Dde protection strategy supports iterative design cycles in which intermediate peptides or peptide-like constructs are modified in a controlled order, reducing side-product formation associated with unprotected diamines.
3. Protected Amino Acid Intermediate Synthesis
Boc-L-Dap(Dde)-OH is also used as a pharmaceutical-intermediate style building block for preparing Dap-containing intermediates that must retain orthogonal protection for later conversion into defined amine-functional products. Process development teams and synthetic chemists value the protected diamine functionality for building well-defined coupling partners used in peptide-derived libraries and specialized conjugates. By maintaining masked amine reactivity until the appropriate stage, this reagent supports reliable downstream transformations where selective activation of only one functional group is required to reach a targeted intermediate profile.
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