1.1: 79 percent / mCPBA / CH2Cl2 / 18 h 2.1: 90 percent / BF3*Et2O / diethyl ether / 5 h / Heating 3.1: NaHMDS / tetrahydrofuran / 1 h / -78 °C 3.2: 71 percent / tetrahydrofuran / 2 h / -78 °C 4.1: 93.2 percent / aq. HCl / tetrahydrofuran / 20 °C 5.1: 56 percent / NaBH4 / ethanol / 3 h / 0 °C 6.1: aq. NaOH / ethanol / 17 h / Heating View Scheme