1: Amberlite IR 120 (H(+)), NaBH4 / aq. ethanol 2: 48 percent / conc. H2SO4 / 46 h / Heating 3: 80 percent / H2, Et3N / 5percent Pd/C / ethanol / 19 h / 20 °C / 760 Torr 4: 76 percent / TfOH / cyclohexane / 24 h / Ambient temperature 5: 73 percent / NaH / dimethylformamide / 48 h / 20 °C 6: 86 percent / aq. HgCl2 / acetone / 2 h / Heating 7: MsCl, DMAP, pyridine / 2.5 h / 20 °C View Scheme