t-Boc-aminooxy-PEG6-propargyl | CAS 2093152-83-9

t-Boc-aminooxy-PEG6-propargyl is a PEG-based bifunctional click chemistry reagent that combines an aminooxy handle with a propargyl group protected as a t-Boc aminooxy derivative. As a propargyl-containing molecule, it is designed for copper-catalyzed azide–alkyne cycloaddition (CuAAC) workflows, while the aminooxy functionality is commonly used for oxime-related conjugation strategies in downstream bioconjugation. The PEG6 spacer supports solubility and reduces steric constraints, making the reagent well suited for building modular linkers for labeling, surface functionalization, and probe/material assembly where orthogonal attachment chemistries are advantageous.

1. Protein and Peptide Labeling

t-Boc-aminooxy-PEG6-propargyl is used by chemical biology and proteomics groups to prepare azide-reactive labeling reagents and conjugation handles for biomolecular tagging workflows. The propargyl functionality enables efficient CuAAC coupling to azide-bearing reporters, affinity tags, or imaging moieties, while the aminooxy-containing linker supports orthogonal attachment strategies during construct assembly. Researchers commonly incorporate this PEG6 linker to improve aqueous compatibility and to help maintain accessibility of the reactive groups on proteins and peptides, which is particularly useful when building multi-component conjugates such as labeled probes, affinity reagents, or standardized internal controls for analytical assays.

2. Targeting Ligand Conjugates

t-Boc-aminooxy-PEG6-propargyl serves as a practical building block for generating targeting-ligand conjugates in molecular imaging and diagnostic reagent development pipelines. Teams working with azide-functional targeting motifs, such as azide-modified peptides, glycans, or small-molecule recognition elements, use the propargyl group to install these recognition components onto larger scaffolds through CuAAC. The PEG6 spacer is frequently selected to tune hydrophilicity and spacing between the targeting moiety and the conjugate backbone, improving manufacturability of complex constructs and facilitating subsequent coupling steps that rely on the aminooxy functionality for controlled linker architecture.

3. Surface and Material Functionalization

t-Boc-aminooxy-PEG6-propargyl is widely applied in biomaterials science for introducing click-ready alkyne functionality onto polymeric and solid-phase surfaces used in assay development and surface chemistry platforms. After incorporation or immobilization, the propargyl group provides a convenient handle for CuAAC reaction with azide-functional biomolecules, fluorescent labels, or capture ligands to create patterned or functionalized materials. The PEG6 segment helps mitigate nonspecific interactions and supports uniform presentation of reactive sites, which is valuable for constructing stable, reproducible reagent surfaces such as functional coatings, bead-based capture materials, and modular assay components.

4. Multimodal Probe Construction

t-Boc-aminooxy-PEG6-propargyl is used to assemble multimodal chemical probes where modularity and orthogonal chemistry are required for sequential installation of reporters and functional groups. The propargyl group supports CuAAC attachment to azide-bearing imaging or detection elements, while the aminooxy-containing protected functionality supports linker design choices during probe synthesis and final assembly. Molecular imaging and analytical chemistry teams often favor PEG6 spacers to manage probe solubility and to reduce steric hindrance that can limit labeling efficiency on complex probe scaffolds, enabling more consistent performance across library-style synthesis of related probe families.