1: 68 percent / 48 h / 30 °C / Irradiation 2: 1.) Ac2O, H2SO4, 2.) MeONa / 1.) -20 deg C, 10 min, 2.) methanol, 0 deg C, 10 min 3: 92 percent / Et2NSF3 / CH2Cl2 / 0.17 h / -30 °C 4: 49 percent / toluene / 0.5 h / -20 - 20 °C 5: 1.) pTSA, 2.) Dess-Martin's periodinane / 1.) MeOH, CH2Cl2, RT, 2 h, 2.) CH2Cl2, RT, 30 min 7: LiOH / tetrahydrofuran; H2O / 18 h / Ambient temperature 8: Li, liq. NH3 / ethanol / 0.5 h / -78 °C View Scheme