N-(Azide-PEG8)-N'-Boc-Lys is a PEG linker featuring an azide group, and a lysine featuring a Boc-protected ε-amine and a free carboxylic acid. The azide is easily used in click chemistry to form stable triazoles with terminal alkynes and cyclooctynes while the carboxylic acid may be used to couple with amines or alcohols to form amides or esters respectively. Finally, the ε-amine may be Boc-deprotected with acid to allow for use such as in couplings with carboxylic acids, reductive aminations with aldehydes or ketones, SNAr with electron-deficient aromatic groups, or for constructing N-heterocycles such as pyrroles.
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