1: 75 percent / various solvent(s) / 0.5 h / 140 °C 2: 1) tBuLi; 2) oxalic acid, H2O / 1) THF, -78 degC, 2 h; 2) THF, 5 degC, 30 min 4: 50 percent / NaN(SiMe3)2 / tetrahydrofuran 5: 1) p-TsOH; 2) 2percent aq. NaOH / 1) MeOH; 2) Et2O 6: 90 percent / iBu2AlH / tetrahydrofuran / -40 °C 7: 1) Ac2O; 2) Li / 1) pyridine; 2) EtNH2, -78 degC View Scheme

mercury(II) diacetate 48 h;

1: 93 percent / SnCl4 / CH2Cl2 / -78 °C 2: 80 percent / NaBH4 / ethanol / -10 °C 3: 54 percent / Hg(OAc)2 / 48 h View Scheme

1: 80 percent / NaBH4 / ethanol / -10 °C 2: 54 percent / Hg(OAc)2 / 48 h View Scheme

1: 93 percent / SnCl4 / CH2Cl2 / -78 °C 2: 80 percent / NaBH4 / ethanol / -10 °C 3: 54 percent / Hg(OAc)2 / 48 h View Scheme

1: 75 percent / various solvent(s) / 0.5 h / 140 °C 2: 1) tBuLi; 2) oxalic acid, H2O / 1) THF, -78 degC, 2 h; 2) THF, 5 degC, 30 min 4: 50 percent / NaN(SiMe3)2 / tetrahydrofuran 5: 1) p-TsOH; 2) 2percent aq. NaOH / 1) MeOH; 2) Et2O 6: 90 percent / iBu2AlH / tetrahydrofuran / -40 °C View Scheme

1: 75 percent / various solvent(s) / 0.5 h / 140 °C 2: 1) tBuLi; 2) oxalic acid, H2O / 1) THF, -78 degC, 2 h; 2) THF, 5 degC, 30 min View Scheme

1: 75 percent / various solvent(s) / 0.5 h / 140 °C 2: 1) tBuLi; 2) oxalic acid, H2O / 1) THF, -78 degC, 2 h; 2) THF, 5 degC, 30 min 4: 50 percent / NaN(SiMe3)2 / tetrahydrofuran 5: 1) p-TsOH; 2) 2percent aq. NaOH / 1) MeOH; 2) Et2O View Scheme

in various solvent(s) T=140°C; 0.5 h;