1: 80 percent / H2, Et3N / 5percent Pd/C / ethanol / 19 h / 20 °C / 760 Torr 2: 76 percent / TfOH / cyclohexane / 24 h / Ambient temperature 3: 73 percent / NaH / dimethylformamide / 48 h / 20 °C 4: 86 percent / aq. HgCl2 / acetone / 2 h / Heating 5: MsCl, DMAP, pyridine / 2.5 h / 20 °C View Scheme