1: 94 percent / NaIO4 / H2O; methanol / 16 h / Ambient temperature 2: 1.) TFAA, 2.) BF3*Et2O / 1.) benzene, RT, 1 h, 2.) benzene, RT, 2 h 3: 65 percent / NaBH4, NiCl2*6H2O / methanol; tetrahydrofuran / 0.5 h / Ambient temperature 4: 91 percent / 10percent aq. NaOH / ethanol / 4 h / Heating View Scheme

1: 94 percent / NaIO4 / H2O; methanol / 16 h / Ambient temperature 2: 1.) TFAA, 2.) BF3*Et2O / 1.) benzene, RT, 1 h, 2.) benzene, RT, 2 h 3: 65 percent / NaBH4, NiCl2*6H2O / methanol; tetrahydrofuran / 0.5 h / Ambient temperature 4: 87 percent / LiAlH4 / tetrahydrofuran / 2 h / Heating View Scheme