1: hydrazine / methanol; chloroform; water / 12 h / 20 °C 2: acetic acid / water / 0.5 h / 20 °C 3: oxygen; copper(II) bis(trifluoromethanesulfonate) / toluene / 3 h / 80 °C View Scheme
1: hydrazine / methanol; chloroform; water / 12 h / 20 °C 2: acetic acid / water / 0.5 h / 20 °C 3: oxygen; copper(II) bis(trifluoromethanesulfonate) / toluene / 3 h / 80 °C View Scheme