1: 1,8-diazabicyclo[5.4.0]undec-7-ene / dichloromethane / 48 h / 20 °C 2: hydroxylamine hydrochloride; sodium acetate / dichloromethane / 4 h / 20 °C 3: sodium hydride / tetrahydrofuran; mineral oil / 0 - 20 °C / Inert atmosphere 4: tetrakis(triphenylphosphine) palladium(0); triethylamine / N,N-dimethyl-formamide / 0.13 h / 80 °C / Inert atmosphere View Scheme