Azido-PEG1-t-butyl acetate | CAS 1820717-35-8

Azido-PEG1-t-butyl acetate is a PEG-linked azide building block designed for click chemistry workflows, providing an azide handle for bioorthogonal conjugation and a protected acetate functionality that can support downstream labeling or material functionalization strategies. As an azide-based click reagent, it is commonly selected for strain-promoted or copper-catalyzed azide–alkyne cycloaddition (depending on the partner reagent) to install PEG spacers and functional groups into probes, surfaces, and biomolecule conjugates. Its compact PEG1 architecture and t-butyl acetate protection make it a practical reagent for constructing conjugation-ready intermediates used in chemical biology, imaging reagent development, and materials labeling.

1. PEGylated Probe Conjugation

Azido-PEG1-t-butyl acetate is widely used to introduce a short PEG spacer onto small-molecule probes, affinity ligands, and labeling reagents prior to conjugation to an alkyne-bearing partner. The azide functionality enables modular attachment in click chemistry pipelines, while the PEG1 segment helps tune solubility and reduce nonspecific interactions during probe preparation and assay development. Researchers often incorporate this reagent when they need a compact PEG handle that remains compatible with typical labeling and purification steps used for fluorescence, luminescence, or enrichment-based workflows.

2. Surface Functionalization via Click

Azido-PEG1-t-butyl acetate is suitable for preparing azide-functional surfaces and coatings that can be rapidly coupled to alkyne-modified linkers, tags, or capture moieties through click chemistry. In biomaterials and interface science, the PEG1 spacer can improve wettability and accessibility of reactive sites, which is valuable when immobilizing recognition elements on polymer films, hydrogel surfaces, or microfabricated substrates. The t-butyl acetate protection offers a convenient protected-group motif for constructing intermediate materials that can be further processed to adjust surface chemistry prior to final coupling.

3. Affinity Tag and Enrichment Reagents

Azido-PEG1-t-butyl acetate is commonly employed in the synthesis of click-ready affinity reagents, including azide-bearing handles for coupling to alkyne-functional affinity tags used in enrichment and pull-down workflows. Chemical biology groups use such reagents to build modular capture platforms where the PEG1 spacer supports efficient presentation of the binding construct and helps maintain compatibility with complex sample matrices. The reagent’s azide group provides a straightforward route to assemble multicomponent enrichment reagents used for isolating labeled targets, tracking biomolecular interactions, or preparing standardized reagent panels for downstream analytical experiments.

4. Molecular Imaging Labeling Workflows

Azido-PEG1-t-butyl acetate is used as a PEG-linked azide intermediate in molecular imaging labeling workflows that rely on click chemistry for attaching imaging reporters to targeting scaffolds or scaffold-adjacent linkers. The PEG1 segment can be advantageous for balancing hydrophilicity and minimizing aggregation during probe formulation, particularly when preparing radiolabeling or fluorophore-conjugation intermediates. Teams developing imaging reagents often select this type of azide handle to streamline modular assembly, enabling rapid exchange of alkyne-bearing imaging moieties while maintaining consistent linker architecture across probe series.