1: 86 percent / conc. HCl / dioxane / 48 h / Ambient temperature 2: 96 percent / pyridine / 4 h / Ambient temperature 3: 95 percent / DBU / acetonitrile / Ambient temperature; overnight 4: 91 percent / HCl / dimethylformamide / 0.75 h / 100 °C 5: 95 percent / Bu3SnH, 2,2'-azobis(2-methylpropiononitrile) / toluene / 0.75 h / 100 °C 6: 83 percent / NaOMe / methanol / Ambient temperature; overnight 7: conc. H2SO4 / acetone; dimethylformamide / 0.5 h 8: 91 percent / pyridine / 4 h / Ambient temperature 9: 82 percent / LiN3 / dimethylformamide / 5 h / 100 °C 10: 94 percent / Dowex 50(H+), 80percent aq. MeOH / 0.67 h / Heating 11: 1) Dowex 1(IO4-), 2) Dowex 1(BH4-) / 1) 80percent aq. MeOH, r.t., 1.5 h, 2) r.t., 1.5 h View Scheme

1: 86 percent / conc. HCl / dioxane / 48 h / Ambient temperature 2: 96 percent / pyridine / 4 h / Ambient temperature 3: 95 percent / DBU / acetonitrile / Ambient temperature; overnight 4: 91 percent / HCl / dimethylformamide / 0.75 h / 100 °C 5: 95 percent / Bu3SnH, 2,2'-azobis(2-methylpropiononitrile) / toluene / 0.75 h / 100 °C 6: 83 percent / NaOMe / methanol / Ambient temperature; overnight 7: conc. H2SO4 / acetone; dimethylformamide / 0.5 h 8: 91 percent / pyridine / 4 h / Ambient temperature 9: 82 percent / LiN3 / dimethylformamide / 5 h / 100 °C 10: 94 percent / Dowex 50(H+), 80percent aq. MeOH / 0.67 h / Heating View Scheme