1: 79 percent / K2CO3 / acetone / 48 h / Heating 2: 61 percent / HgO, I2 / ethanol / 0.5 h / 50 °C 3: 83 percent / NaBH4 / tetrahydrofuran; ethanol; H2O / 1.5 h / Heating 4: 0.5 h 5: benzene / Heating 6: 56 percent / Pd(OAc)2, PPh3, Et3N / acetonitrile / 12 h / 80 °C 7: 92 percent / OsO4 / 2-methyl-propan-2-ol; acetone; H2O / 336 h / Ambient temperature 8: MnO2 / CH2Cl2 / 12 h / Ambient temperature 9: Zn, AcOH / Heating View Scheme

potassium carbonate in acetone 48 h; Heating;