DBCO-PEG2-NH-Boc | CAS 2377004-08-3

DBCO-PEG2-NH-Boc is a cyclooctyne-based click chemistry reagent designed for strain-promoted azide–alkyne cycloaddition (SPAAC), featuring a DBCO moiety for rapid bioorthogonal conjugation and a short PEG2 spacer to improve solubility and reduce steric constraints. The molecule is presented with a protected amine (Boc) that supports downstream functionalization after conjugation, making it useful for constructing linkers, surface-modified biomaterials, and modular chemical handles. Its PEG spacer and stable click functionality make it a common choice in chemical biology workflows where precise attachment of azide-bearing partners is required.

1. Bioconjugation Linkers

DBCO-PEG2-NH-Boc is widely used to generate azide-reactive conjugates in chemical biology and biomaterials research, particularly when a PEG spacer is desired to maintain accessibility of the newly introduced functional group. Researchers employ this reagent to append a protected amine-containing handle onto azide-bearing biomolecules, affinity reagents, or polymer scaffolds, enabling subsequent deprotection and coupling steps for building multicomponent constructs. The Boc-protected amine is especially valuable in workflows that require orthogonal control over reactivity, allowing the conjugate to be carried through additional labeling or purification steps before the amine is activated for further derivatization.

2. Surface Functionalized Materials

DBCO-PEG2-NH-Boc supports the preparation of clickable surfaces and coatings by reacting with azide-functionalized substrates such as polymer films, hydrogel components, or bead-based supports. Materials scientists use the PEG2 spacer to improve the effective reach of the reactive group from the surface, which can enhance the uniformity of subsequent azide–DBCO coupling events in patterned or batch conjugation workflows. After attachment, the Boc-protected amine provides a protected functional handle for later immobilization chemistry, enabling stepwise fabrication of surfaces used for affinity capture, reagent immobilization, or multivalent binding architectures.

3. Modular Probe Construction

DBCO-PEG2-NH-Boc is commonly incorporated into probe development pipelines where a controllable amine functionality is needed after click attachment. Molecular imaging and diagnostic reagent developers use SPAAC to assemble probe conjugates from azide-bearing targeting elements and DBCO-functional linkers, with the PEG2 spacer helping maintain probe performance by reducing steric hindrance at the conjugation site. The Boc-protected amine enables downstream attachment of additional chemical groups, such as solubilizing tags, purification handles, or secondary reactive moieties, supporting iterative optimization of probe format without reworking the initial click step.

4. PEG-Based Polymer Conjugates

DBCO-PEG2-NH-Boc is used to build PEG-containing polymer conjugates that benefit from improved aqueous compatibility and reduced aggregation in solution-phase applications. Polymer chemists and bioconjugation specialists employ the DBCO group to click onto azide-functional polymer backbones or polymer-coated nanoparticles, generating conjugates that can be further modified through Boc deprotection and subsequent amide or amine-based coupling chemistry. This reagent is particularly relevant in industrial and translational research settings where modular linker design and reproducible conjugation strategies are required for creating standardized reagent libraries and scalable material formats.