N-Azido-PEG4-N-Boc-N-PEG3-Boc | CAS 2093152-85-1

N-Azido-PEG4-N-Boc-N-PEG3-Boc is a PEG-based azide building block designed for copper-free and copper-mediated click chemistry workflows, providing a flexible, hydrophilic spacer architecture that helps improve solubility and reduce nonspecific interactions in labeling and conjugation formats. The molecule contains an azide functional group for bioorthogonal or click-compatible coupling, along with Boc-protected amines that enable controlled downstream deprotection and subsequent functionalization. This reagent is commonly used by chemical biology and biomaterials teams to prepare PEGylated conjugates, modular linkers, and imaging or diagnostic scaffolds where spacing and handle density are critical.

1. Bioconjugation Linker Development

N-Azido-PEG4-N-Boc-N-PEG3-Boc is widely used as a modular PEG linker precursor for constructing conjugates that require an azide handle and tunable spacing between biomolecules and functional payloads. Researchers in chemical biology and protein engineering incorporate this type of PEG-azide reagent to support site-specific or modular assembly of labeled probes, affinity reagents, and surface-tethered constructs while maintaining colloidal stability and minimizing aggregation. The Boc-protected amines offer a convenient strategy for introducing additional reactive functionality after deprotection, enabling iterative build-up of multifunctional conjugates for downstream assays and material functionalization.

2. Fluorescent Probe and Imaging Tags

N-Azido-PEG4-N-Boc-N-PEG3-Boc is commonly selected for preparing fluorescent labeling reagents and imaging-oriented tagging platforms that benefit from PEG-mediated distance control. By providing an azide group for click-compatible attachment to alkyne-bearing dyes, reporters, or imaging moieties, this reagent helps maintain optical probe accessibility and reduces steric interference when probes are conjugated to targeting ligands or macromolecular carriers. The PEG4/PEG3 spacer design is particularly useful in workflows where probe performance depends on linker length and reduced background interactions during imaging experiments and analytical readouts.

3. Surface Functionalization for Biomaterials

N-Azido-PEG4-N-Boc-N-PEG3-Boc is used in biomaterials and materials chemistry settings to introduce click-reactive azide functionality onto polymeric or hybrid surfaces, coatings, and scaffolds. Surface engineering teams often rely on PEG-based linkers to improve wettability, reduce nonspecific adsorption, and provide a controlled tether length for subsequent attachment of capture ligands, reporter molecules, or cell-interaction components. After immobilization or coupling, Boc-protected amines can be leveraged to create additional reactive sites for orthogonal coupling steps, supporting fabrication of multicomponent materials used in research-grade diagnostics development and analytical platforms.

4. Diagnostic Reagent and Assay Building

N-Azido-PEG4-N-Boc-N-PEG3-Boc supports the assembly of diagnostic reagent components and assay-ready conjugates where modular chemistry and consistent linker architecture are required. In analytical chemistry and diagnostic reagent development, azide-bearing PEG linkers are frequently used to connect recognition elements, signal reporters, and solid supports through click-compatible coupling to alkyne-functional partners. The presence of protected amines provides flexibility for later derivatization, enabling developers to tune conjugate composition for multiplexing strategies, standardized reagent formats, and robust reagent handling in high-throughput analytical workflows.