1: p-toluenesulfonic acid / methanol / 24 h / 50 °C 2: H2 / Lindlar catalyst / methanol / 12 h / 23 °C / 760 Torr 3: acetonitrile / 4 h 4: benzyltrimethylammonium dichloroiodate / tetrahydrofuran / 1.75 h / 60 °C 5: acetonitrile / 40 h / 35 °C 6: aq. HCl / methanol / 16 h / 23 °C 7: H2O / 4 h / 95 °C View Scheme