1: 72 percent / TBAF / tetrahydrofuran / 0.5 h / Ambient temperature 2: 95 percent / NaH, LiBr / 1,2-dimethoxy-ethane; dimethylformamide; toluene / 24 h / 75 °C 3: 38 percent / Me6Sn2 / benzene / 24 h / 80 °C / Irradiation 4: 85 percent / PCC, Celite / CH2Cl2 / Ambient temperature View Scheme