t-Boc-Aminooxy-PEG7-amine

t-Boc-Aminooxy-PEG7-amine is a polyethylene glycol-based linker reagent designed to support PROTAC assembly through an aminooxy functional handle and a protected amine for controlled coupling. Its PEG-rich, flexible scaffold helps tune linker length and conformational freedom, often improving productive geometry between target-binding ligands and the recruited E3 ligase. The t-Boc group enables stepwise synthesis, while the aminooxy functionality supports chemoselective bond formation.

Structure: The molecule contains a PEG oligomer backbone bearing terminal amino and aminooxy functionalities, with a tert-butoxycarbonyl protecting group on the amine. Ether linkages within the PEG chain confer flexibility and hydrophilicity, while the aminooxy group provides an oxygen-nucleophile suitable for reversible oxime-type chemistry.

Reactivity: For PROTAC construction, the t-Boc-protected amine is typically deprotected under standard acidolysis conditions to reveal a primary amine for amide or carbamate coupling. The aminooxy group is commonly used to form oxime linkages by reaction with carbonyl-bearing partners under mildly acidic to neutral conditions, often proceeding via condensation that can be driven by removal of water. Solvents such as polar aprotic or alcohol/water mixtures are frequently used, with appropriate coupling reagents for amide formation.