1: LiBr, ZnBr2, PBr3 / tetrahydrofuran / 5 h / -60 °C 2: LDA, DMPU / tetrahydrofuran / 1.) -78 deg C, 10 min, 2.) -78 deg C, 5 h 3: AcOH, NaOAc, H2O / diethyl ether / 1 h 4: 100 percent / Et3N / benzene / 0.5 h / 0 °C 5: Me3Al/AlCl3 / benzene; tetrahydrofuran; toluene / 2 h / Ambient temperature 6: H2O, SiO2 7: 55 percent / benzene / 0 °C / Irradiation 8: TFA / CH2Cl2 / 1 h / 0 °C View Scheme