1: (2R,5R)-2-tert-butyl-3-methyl-5-phenyl-4-imidazolidinone*TCA; sodium hydrogencarbonate; copper(I) bromide / diethyl ether; toluene / 3 h / 0 °C / Inert atmosphere 2: 2,2,6,6-tetramethyl-piperidine-N-oxyl; [bis(acetoxy)iodo]benzene / diethyl ether; water; toluene; acetonitrile / 3 h / 20 °C View Scheme