1: 65 percent / NaH / tetrahydrofuran 2: KHMDS / tetrahydrofuran / 0 - 20 °C 3: hydrogen peroxide / tetrahydrofuran / 0 °C 4: 78 percent / hydrogen / PtO2 / ethanol / 360 h / 4137.2 Torr 5: 67 percent / aq. NaCl / dimethylsulfoxide / 2 h / 170 °C 6: TFA 7: Et3N 8: 50 percent / EtO2*BF3 / CH2Cl2 / Ambient temperature 9: 95 percent / sodium methoxide / 4 h / Ambient temperature 10: LiHMDS / tetrahydrofuran / 0 °C 11: 85 percent / 1.) 1N NaOH; 2.) HCl; 3.) Dowex50xB View Scheme