1: 79 percent / t-BuOOH, V2O5 2: n-BuLi / tetrahydrofuran / 1 h / -78 °C 3: PdCl2, CuCl, O2 / dimethylformamide; H2O / 12 h / Ambient temperature 4: 1.) DBU, CH2Cl2, reflux, 1 hr 2.) Pd/C, H2, EtOH View Scheme

1: 79 percent / t-BuOOH, V2O5 2: n-BuLi / tetrahydrofuran / 1 h / -78 °C 3: PdCl2, CuCl, O2 / dimethylformamide; H2O / 12 h / Ambient temperature 4: 1.) DBU, CH2Cl2, reflux, 1 hr 2.) Pd/C, H2, EtOH View Scheme

1: 89 percent / 30percent H2O2 / methanol / 12 h / Ambient temperature 2: 90 percent / NaHCO3 / toluene / 2 h / Heating View Scheme

1: 89 percent / 30percent H2O2 / methanol / 12 h / Ambient temperature 2: 70 percent / (CF3CO)2O / 72 h / Ambient temperature 3: 74 percent / NasBH4 / aq. ethanol / 12 h / Ambient temperature 4: 79 percent / vanadyl acetylacetonate, 45percent tert-butylhydroperoxide / benzene / 2 h / Heating 5: 34 percent / CrO3-2py complex / CH2Cl2 / 1.5 h / Ambient temperature View Scheme

1: 89 percent / 30percent H2O2 / methanol / 12 h / Ambient temperature 2: 70 percent / (CF3CO)2O / 72 h / Ambient temperature 3: 74 percent / NasBH4 / aq. ethanol / 12 h / Ambient temperature View Scheme