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t-Boc-N-Amido-PEG4-azide is a N-Boc protected PEG reagent. It can react with alkyne, BCN, DBCO via Click Chemistry. The Boc group can be deprotected under mild acidic conditions to form the free amine.

Boc-NH-PEG4-azide is a PEG-based PROTAC linker that can be used in the synthesis of PROTACs[1]. Boc-NH-PEG4-azide is a click chemistry reagent, it contains an Azide group and can undergo copper-catalyzed azide-alkyne cycloaddition reaction (CuAAc) with molecules containing Alkyne groups. It can also undergo strain-promoted alkyne-azide cycloaddition (SPAAC) reactions with molecules containing DBCO or BCN groups.

PEGs

[1] An S, et al. Small-molecule PROTACs: An emerging and promising approach for the development of targeted therapy drugs. EBioMedicine. 2018 Oct;36:553-562 DOI:10.1016/j.ebiom.2018.09.005