1: 100 percent / Pb(OAc)4 / CH2Cl2 / 0 °C 2: silica gel View Scheme

1: 100 percent / Pb(OAc)4 / CH2Cl2 / 0 °C 2: silica gel View Scheme

trifluoroacetic acid

1: 50 percent / sodium hydride / 1,2-dimethoxy-ethane / 20 h / Heating 2: 55 percent / p-toluenesulfonic acid / benzene / 24 h / Heating 3: 62 percent / diborane / tetrahydrofuran / 48 h / 25 °C 4: 50 percent / conc. HCl / methanol; H2O / 0.17 h / Heating View Scheme

1: 62 percent / diborane / tetrahydrofuran / 48 h / 25 °C 2: 50 percent / conc. HCl / methanol; H2O / 0.17 h / Heating View Scheme

1: 50 percent / sodium hydride / 1,2-dimethoxy-ethane / 20 h / Heating 2: 55 percent / p-toluenesulfonic acid / benzene / 24 h / Heating 3: 62 percent / diborane / tetrahydrofuran / 48 h / 25 °C 4: 50 percent / conc. HCl / methanol; H2O / 0.17 h / Heating View Scheme

1: 55 percent / p-toluenesulfonic acid / benzene / 24 h / Heating 2: 62 percent / diborane / tetrahydrofuran / 48 h / 25 °C 3: 50 percent / conc. HCl / methanol; H2O / 0.17 h / Heating View Scheme