1: 98 percent / pyridine / 14 h / -4 °C 2: 85 percent / LiI / tetrahydrofuran / 0.25 h / Heating View Scheme

1: pyridine / 2 h / Ambient temperature 2: potassium t-butoxide / dimethylformamide / 4 h / Ambient temperature 3: WO3, 50percent NaOH, 30percent H2O2 / H2O; ethanol / 0.67 h / 60 - 75 °C 4: 92 percent / PPTS / CH2Cl2 / 4 h / Ambient temperature 5: n-butyllithium / hexane; tetrahydrofuran / 1 h / -70 - -60 °C 6: Na2HPO4, 5percent sodium amalgam / methanol / 0 deg C, 15 h, then RT, 3 h 7: PPTS / aq. ethanol / 1 h / 50 °C 8: LiAlH4 / tetrahydrofuran / 1.5 h / Heating 9: diethyl ether; tetrahydrofuran / 0.05 h / Irradiation 10: ethanol / 1 h / Heating View Scheme

1: 98 percent / pyridine / 14 h / -4 °C 2: 85 percent / LiI / tetrahydrofuran / 0.25 h / Heating 3: 100 percent / acetonitrile / 40 h / Heating View Scheme

1: 90 percent / pyridine 2: 91 percent / potassium tert-butylate / dimethylformamide 3: 99 percent / Na2WO4, H2O2 / 70 °C 4: 95 percent / pyridinium p-toluenesulphonate / CH2Cl2 5: 1) lithium diisopropylamide / 1) THF, -78 deg C 6: 52 percent / 5percent Na-Hg, Na2HPO4 / 0 °C 7: 95 percent / 95percent ethanol / pyridinium p-toluenesulphonate / 40 °C 8: irradiation followed by thermal isomerization View Scheme

1: in diethyl ether T=10 - 25°C; 2: With hydrogenchloride in diethyl ether; water T=10 - 25°C; pH=4;

1: in tetrahydrofuran; diethyl ether T=0 - 20°C; 2 h; 2: With hydrogenchloride; water in tetrahydrofuran; diethyl ether T=0°C;

in diethyl ether T=0°C; 1 h;

1: 92 percent / NaH / dimethylsulfoxide / Ambient temperature 2: 93 percent / diethyl ether / -20 °C View Scheme

1: 25 percent / tert-butylhydroperoxide, titanium(IV) isopropoxyde, D-(-)-dibutyl tartarate / CH2Cl2 / -20 °C 2: 92 percent / NaH / dimethylsulfoxide / Ambient temperature 3: 93 percent / diethyl ether / -20 °C View Scheme

1: 93 percent / diethyl ether / -20 °C View Scheme