in chloroform Heating;

1: 1.) pyridine-SO3/Et3N / 1.) DMSO, room temp., 30 min; 2.) ether, 2 h, room temp. 2: 2.64 g / NaBH4 / methanol / 1.5 h / 0 °C 3: 789 mg / conc. HCl / H2O; acetone / 3.25 h / 3 °C 4: 184 mg / p-TsOH / CH2Cl2 / 0.75 h / 0 °C 5: sodium methylsulfinylmethide / dimethylsulfoxide / 30 h / Ambient temperature 6: 97 mg / diethyl ether 7: 514 mg / aq. acetic acid / 24 h / 30 - 40 °C 8: 188 mg / pyridine / 3 °C 9: 216 mg / 5percent KOH / methanol; H2O / 2 h / Ambient temperature View Scheme

in diethyl ether