1: 97 percent / NaIO4 / H2O; methanol / Ambient temperature 2: 1.) TFAA; 2.) BF3*Et2O / 1.) benzene, RT, 1 h; 2.) benzene, RT, 1 h 3: 89 percent / NaBH4, NiCl2*6H2O / methanol; tetrahydrofuran / 0.5 h / Ambient temperature 4: 92 percent / aq. NaOH / ethanol / 20 h / Heating View Scheme

1: 97 percent / NaIO4 / H2O; methanol / Ambient temperature 2: 1.) TFAA; 2.) BF3*Et2O / 1.) benzene, RT, 1 h; 2.) benzene, RT, 1 h 3: 89 percent / NaBH4, NiCl2*6H2O / methanol; tetrahydrofuran / 0.5 h / Ambient temperature 4: 90 percent / LiAlH4 / tetrahydrofuran / Heating View Scheme