1: 56 percent / toluene-p-sulphonic acid / 17 h / Ambient temperature 2: 65 percent / di-isobitylaluminium hydride / tetrahydrofuran; hexane / 5 h / Ambient temperature 3: 580 mg / pyridine / 16 h / Ambient temperature 4: NaBH4 / methanol; tetrahydrofuran / 3 h / Ambient temperature 5: 260 mg / pyridine / 3 h / Ambient temperature 6: 96 percent / NaI / acetone / 72 h / Heating 7: 98 percent / Bu3SnH / tetrahydrofuran / 18 h / Ambient temperature 8: 396 mg / 5percent KOH-MeOH / tetrahydrofuran / 1 h / Ambient temperature 9: pyridine / 2 h / Ambient temperature 10: 1.) BF3-THF complex, 2.) 2N NaOH, 30percent H2O2, 3.) pyridinium chloroformate 11: 209 mg / LiBr / dimethylformamide / 1 h / Heating 12: 220 mg / OsO4, N-methylmorpholine N-oxide / 2-methyl-propan-2-ol; tetrahydrofuran; H2O / 3 h 13: 70percent AcOH / H2O / 4 h / 65 °C View Scheme