Boc-aminooxy-PEG5-propargyl | CAS 2086688-98-2

Boc-aminooxy-PEG5-propargyl is a protected aminooxy-functionalized, PEGylated propargyl reagent designed for click chemistry workflows, most commonly used as a handle for copper-catalyzed azide–alkyne cycloaddition (CuAAC) after deprotection and/or conjugation steps in multi-component labeling strategies. Its structure combines an aminooxy group for selective oxime/hydrazone-type conjugation chemistry with a propargyl alkyne for robust click attachment, while the PEG5 spacer improves solubility and reduces nonspecific interactions in aqueous labeling. This reagent is therefore frequently selected for building well-defined, water-compatible conjugates used in chemical biology, biomaterials functionalization, and molecular imaging reagent development.

1. Targeted Probe Conjugation

Boc-aminooxy-PEG5-propargyl is used to generate modular labeling reagents where an aminooxy functionality enables attachment to carbonyl-bearing biomolecules or linkers, followed by installation of a clickable alkyne handle for subsequent CuAAC coupling to azide-functional probes. Researchers commonly incorporate this reagent into workflows for preparing fluorescent tags, affinity reagents, or enrichment handles that require both aqueous compatibility and orthogonal conjugation options. The PEG5 spacer helps maintain probe solubility during conjugation and downstream purification, supporting consistent performance in labeling and analytical characterization.

2. Surface And Hydrogel Functionalization

Boc-aminooxy-PEG5-propargyl supports the functionalization of biomaterial surfaces and polymeric matrices where clickable alkyne groups are required for later attachment of biomolecules, dyes, or capture ligands. In materials science and biomaterials research, the reagent is often used as an intermediate to introduce PEG-mediated spacing that can improve accessibility of reactive sites on surfaces and within hydrogels, reducing steric hindrance during subsequent azide–alkyne coupling. This approach is widely adopted for constructing biointerfaces with defined chemical composition for assay development and materials-based biosensing platforms.

3. Multicomponent Labeling Workflows

Boc-aminooxy-PEG5-propargyl is well suited for sequential, multicomponent labeling strategies that benefit from combining an aminooxy reactive handle with a propargyl alkyne for late-stage click attachment. Chemical biology teams use this reagent to assemble complex conjugates in a controlled order, enabling the introduction of PEG-tethered linkers and then performing CuAAC to attach reporters, affinity tags, or imaging moieties with minimal cross-reactivity with many common functional groups. The protected Boc group provides a practical protection strategy during reagent handling and storage, facilitating integration into standardized labeling pipelines.

4. Molecular Imaging Reagent Building

Boc-aminooxy-PEG5-propargyl is commonly incorporated into the synthesis of imaging and detection reagents where a stable, water-compatible linker and a click-ready alkyne are required for coupling to azide-bearing imaging reporters. Molecular imaging and diagnostic reagent development groups use PEG5-containing click handles to improve solubility and reduce aggregation, which is particularly important when preparing probe libraries for screening and assay optimization. The aminooxy/propargyl dual functionality enables flexible assembly of probe architectures, allowing the alkyne to serve as a reliable attachment point during final conjugate formation.