1: 17 g / pyridine / 8 h / 0 °C 2: 74 percent / NaHCO3, NaI / acetone / 40 h / Heating 3: 82 percent / n-BuLi / hexamethylphosphoric acid triamide; tetrahydrofuran; hexane / 1 h / Ambient temperature 4: 79 percent / Na / tetrahydrofuran; liquid ammonia / 1 h 5: 431 mg / PCC, NaOAc / CH2Cl2 / 2.5 h / Ambient temperature 6: 570 mg / diisopropylamine / dimethylsulfoxide / Ambient temperature 7: 54 percent / pyrrolidine / hexamethylphosphoric acid triamide / Ambient temperature 8: 97 percent / PPTS / CH2Cl2 / Ambient temperature 9: 98 percent / 0.13N LiOH / methanol; H2O / 18 h / 50 °C 10: 93 percent / n-Bu4NF / tetrahydrofuran / 5 h / Ambient temperature 11: 47 percent / triphenylphosphine, dipyridyl disulfide / xylene / Ambient temperature 12: 35 mg / acetic acid; tetrahydrofuran; H2O / 4 h / 50 °C 13: TiCl4 / CH2Cl2 / 0.25 h / 0 °C View Scheme