Multi-step reaction with 6 steps 1: 95 percent / Ac2O / 3 h / Heating2: 2-methyl-propan-2-ol / 3.5 h / 45 °C3: t-BuOK / 6 h / 60 °C4: 100 percent / H2 / RaNi / tetrahydrofuran; ethanol / 12 h / 1034.3 Torr5: 100 percent / 6 M HCl / 2 h / Heating6: 70 percent / Et3N / pyridine / Heating  

Multi-step reaction with 5 steps 1: 2-methyl-propan-2-ol / 3.5 h / 45 °C2: t-BuOK / 6 h / 60 °C3: 100 percent / H2 / RaNi / tetrahydrofuran; ethanol / 12 h / 1034.3 Torr4: 100 percent / 6 M HCl / 2 h / Heating5: 70 percent / Et3N / pyridine / Heating