N-(Azido-PEG2)-N-Boc-PEG4-t-butyl ester is a very useful branched PEG reagent with a terminal azide group, Boc protected amine, and a terminal t-butyl ester. The azide groups is very reactive with alkyne such as DBCO, BCN and propargyl reagnet via Click Chemistry. The protected amine can be deprotected under acidic conditions, and the t-butyl protected carboxyl group can be deprotected under mild acidic conditions.
N-(Azido-PEG2)-N-Boc-PEG4-Boc is a PEG-based PROTAC linker that can be used in the synthesis of PROTACs[1]. N-(Azido-PEG2)-N-Boc-PEG4-Boc 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.
