1: N-bromosuccinimide, benzoyl peroxide / CCl4 / 1 h / Heating 2: DBU / benzene / 2 h / Ambient temperature 3: 84 percent / tetrahydrofuran / 2 h / 0 °C 4: 88 percent / NaIO4, H2O / methanol / Ambient temperature 5: 23 percent / 1 h / Heating View Scheme