N-(Boc-PEG3)-N-bis(PEG3-azide) | CAS 2182602-15-7

N-(Boc-PEG3)-N-bis(PEG3-azide) is a polyethylene glycol (PEG)-based, multifunctional click chemistry reagent bearing multiple azide groups for copper-free or copper-catalyzed azide–alkyne cycloaddition workflows. The reagent combines PEG3 spacers with a protected Boc-containing backbone, enabling flexible incorporation into larger PEG architectures while maintaining azide handles for downstream conjugation. Its solubility and steric presentation make it well suited for building modular bioconjugates, imaging probes, and PEGylated materials that require controlled azide functionality.

1. PEGylated Bioconjugation

N-(Boc-PEG3)-N-bis(PEG3-azide) is widely used as an azide-bearing PEG linker to introduce multiple reactive sites into biomolecule conjugates, including PEGylated proteins, peptides, and antibody fragments used in chemical biology. Researchers and platform developers select this reagent when they need to increase hydrophilicity, tune spacing between functional groups, and provide two azide termini for orthogonal or multivalent coupling strategies. The Boc-protected component can be leveraged during construct assembly to support stepwise material preparation, after which azide groups serve as reliable handles for attachment to alkyne-functional partners such as targeting ligands, affinity tags, or carrier scaffolds.

2. Multivalent Imaging Probe Assembly

N-(Boc-PEG3)-N-bis(PEG3-azide) supports the construction of multivalent molecular imaging reagents by providing a PEG-mediated distance framework with azide groups for click attachment to fluorophores, imaging dyes, or reporter-bearing alkyne conjugates. Molecular imaging and diagnostics reagent developers often rely on PEG spacers to reduce nonspecific interactions and to improve the presentation of multiple labels on a single scaffold. The ability to install two azide functionalities from one reagent is particularly useful when designing probes intended to carry multiple reporters or to couple to structured platforms such as dendrimers and polymeric carriers.

3. Surface Functionalization for Materials

N-(Boc-PEG3)-N-bis(PEG3-azide) is used in biomaterials science and industrial materials R&D to functionalize surfaces and interfaces with PEG-rich, azide-terminated linkers for subsequent click-based patterning. Material engineers commonly apply this reagent to prepare coatings, hydrogel components, and polymer surfaces that can be decorated with alkyne-bearing biomolecules, peptides, or affinity reagents under controlled coupling conditions. The PEG3 spacers help maintain accessibility of reactive sites at the material interface, supporting reproducible conjugation density and improved compatibility with aqueous processing workflows.

4. Modular Diagnostic Reagent Platforms

N-(Boc-PEG3)-N-bis(PEG3-azide) is a practical building block for modular diagnostic reagent platforms where azide-functional PEG linkers are required to assemble multicomponent assay constructs. Diagnostic reagent developers use azide handles to connect capture or detection chemistries to reporters, nanoparticles, or solid supports via click-compatible alkyne partners, enabling flexible reconfiguration of assay formats. By incorporating PEG spacers, this reagent helps manage steric effects and improves the uniformity of conjugate architecture, which is valuable when creating reagent libraries or scalable manufacturing workflows for research-use diagnostic tools.