1: TBAF / tetrahydrofuran / 22 h / Ambient temperature 2: 80 percent / ZnI2 / CHCl3 / 72 h / Ambient temperature 3: pyridine, DMAP / 22 h 4: NaBH4 / dimethylsulfoxide / 3 h / 85 °C 5: PhI(OOCCF3)2, H2O / ethanol / 0.17 h / Ambient temperature View Scheme