1: 90 percent / Li, NH3 (liquid) / tetrahydrofuran 2: 87 percent / pyridine / 1 h / 25 °C 3: toluene / 7 h / Irradiation 4: imidazole / dimethylformamide / 23 °C 5: 1.) O3, 2.) dimethyl sulfide / 1.) methanol 6: CH2Cl2 / 18 h 8: 10percent aq. HCl / tetrahydrofuran / 0.33 h / 45 - 55 °C 9: Ag2CO3/Celite / toluene / 2 h / 95 °C View Scheme