N-Boc-N-bis(PEG2-propargyl) | CAS 2100306-86-1

N-Boc-N-bis(PEG2-propargyl) is a protected, PEG-functionalized propargyl click chemistry reagent designed to introduce two terminal alkyne handles for subsequent copper-catalyzed azide–alkyne cycloaddition (CuAAC) workflows. The bis(PEG2-propargyl) architecture provides water-compatible spacing and reduced steric congestion around the reactive alkyne sites, while the N-Boc protection supports controlled handling during multistep bioconjugation or materials assembly. As a versatile building block, it is commonly selected when researchers need dual-click functionality for multivalent labeling, crosslinking, or modular probe construction in chemical biology and biomaterials research.

1. Dual-Alkyne Probe Labeling

N-Boc-N-bis(PEG2-propargyl) is frequently used to generate multivalent chemical probes where two independent click handles improve labeling density and conjugation efficiency in complex assay formats. The PEG2 spacers help maintain accessibility of each terminal alkyne during conjugation to azide-bearing biomolecules, affinity ligands, or imaging tags. This reagent is particularly relevant for researchers building libraries of clickable intermediates for downstream CuAAC coupling, including probe scaffolds used in target engagement studies, pathway mapping experiments, and workflow development for high-throughput labeling.

2. Biomolecule and Polymer Conjugation

N-Boc-N-bis(PEG2-propargyl) supports the preparation of azide-reactive conjugates and clickable polymer derivatives by providing two alkyne sites for sequential or parallel CuAAC steps. In biomaterials and chemical biology workflows, the PEG2 environment is often leveraged to reduce nonspecific interactions and to tune solubility when attaching functional motifs to proteins, peptides, nucleic-acid components, or PEG-based carriers. The N-Boc-protected backbone also makes it convenient for multistep synthesis of conjugation-ready intermediates, enabling controlled incorporation into larger constructs such as functional coatings, soluble conjugates, and modular reagent platforms.

3. Multivalent Crosslinking Materials

N-Boc-N-bis(PEG2-propargyl) is applied in the fabrication of crosslinked biomaterials and hydrogel-like networks where dual alkyne functionality supports formation of multivalent linkages with azide-bearing components. By installing two CuAAC-reactive termini on a single building block, the reagent can increase effective crosslink density and promote more uniform network formation compared with monofunctional analogs, which is valuable for materials used as chemical scaffolds and delivery-like carriers in research settings. The PEG2 spacing contributes to processability and can help preserve reactivity of both alkyne groups during material mixing, curing, and post-functionalization.

4. Molecular Imaging Reagent Building

N-Boc-N-bis(PEG2-propargyl) is commonly incorporated into molecular imaging reagent pipelines as a dual-click linker that enables modular attachment of imaging moieties to azide-functional targeting vectors or reporter constructs. The reagent’s PEG2-propargyl design supports aqueous compatibility and helps maintain accessibility of the alkyne sites when assembling complex probe architectures. Teams developing imaging toolkits often use this building block to streamline synthesis of intermediate conjugates, allowing flexible substitution of imaging labels and targeting components through standardized CuAAC coupling steps.