The polyethylene glycol (PEG) moiety has become increasingly important in medicinal chemistry. Herein, we describe the PEG functionalization of amines via hydrogen borrowing reductive amination. This was accomplished using the [Ru(p-cymene)Cl2]2 catalyst and phosphorus-containing ligand dppf or DPE to yield a variety of PEGylated primary and secondary amine products. Furthermore, we illustrate the utility of this method with the synthesis of quetiapine (Seroquel) in 62% isolated yield.