N-Boc-N-bis(C2-PEG1-azide) | CAS 2100306-79-2

N-Boc-N-bis(C2-PEG1-azide) is a protected, PEGylated bis-azide building block designed for copper-free and/or copper-mediated azide–alkyne click chemistry workflows. The reagent features a Boc-protected nitrogen core and two azide termini separated by short PEG linkers, enabling efficient multivalent functionalization while improving solubility and reducing nonspecific interactions. Such PEG-azide scaffolds are widely used in chemical biology and biomaterials development to introduce reactive handles for subsequent conjugation, surface patterning, and probe assembly.

1. Multivalent Probe Conjugation

N-Boc-N-bis(C2-PEG1-azide) is commonly used to generate multivalent chemical biology probes where two orthogonally addressable or sequentially functionalizable sites are advantageous. Researchers incorporate the bis-azide scaffold into probe design to tune hydrophilicity and spacing between ligands, which is particularly useful for imaging reagents, affinity reagents, and screening tools that benefit from reduced aggregation. The dual azide functionality supports stepwise assembly of complex probe architectures, including PEG-mediated distance control between targeting motifs and reporter groups.

2. Biomaterial Surface Functionalization

N-Boc-N-bis(C2-PEG1-azide) serves as a practical PEG-azide linker for functionalizing polymeric and hydrogel surfaces with click-reactive moieties. Materials scientists use bis-azide reagents to immobilize bioorthogonal handles onto substrates for downstream conjugation with alkyne-bearing polymers, peptides, or fluorescent tags. The PEG spacer elements help maintain surface wettability and can improve accessibility of immobilized ligands, supporting reproducible labeling of materials used in chemical biology assays, coating development, and surface-based assay platforms.

3. PEG Linker for Bioconjugation

N-Boc-N-bis(C2-PEG1-azide) is well suited for constructing PEG-based bioconjugates where controlled spacing and solubility are key design parameters. In bioconjugation workflows, the bis-azide scaffold can be used to connect biomolecules or biomolecule-derived components to alkyne-functional partners, enabling modular assembly of conjugates for mechanistic studies and reagent development. The presence of two azide groups supports higher loading or multivalent attachment strategies, which are frequently employed to create robust labeling reagents and standardized conjugation intermediates.

4. Molecular Imaging Reagent Assembly

N-Boc-N-bis(C2-PEG1-azide) is used in the preparation of imaging reagent components that require click-ready PEG linkers for attaching reporter payloads. Chemical biology groups often select PEGylated azide scaffolds to improve dispersion of labeling constructs and to manage the effective distance between a reporter and a binding or recognition element introduced later via alkyne coupling. The bis-azide design also supports the creation of dual-reporter or multi-component imaging assemblies used as research tools in fluorescence-based and other molecular imaging modalities.

5. Diagnostic Reagent Platform Building

N-Boc-N-bis(C2-PEG1-azide) is applied as a building block for diagnostic reagent platforms that rely on modular, click-based assembly of detection components. Developers use the bis-azide scaffold to incorporate PEG spacers into assay reagents, improving handling and reducing nonspecific interactions during reagent preparation and assay workflows. By providing two azide termini for sequential or parallel coupling to alkyne-bearing elements, this reagent supports the creation of standardized conjugation intermediates used in assay development, probe libraries, and signal-generation reagent systems.