1: 98 percent / Ac2O / 1 h / 70 °C 2: 96 percent / aq. NaIO4 / methanol / 20 h / Ambient temperature 3: 97 percent / TFAA / benzene / 20 h / Ambient temperature 4: 74 percent / NaBH4, NiCl2*6H2O / methanol; tetrahydrofuran / 0.5 h / Ambient temperature 5: 100 percent / 10percent NaOH / ethanol / 4 h / Ambient temperature View Scheme

1: 98 percent / Ac2O / 1 h / 70 °C 2: 96 percent / aq. NaIO4 / methanol / 20 h / Ambient temperature 3: 97 percent / TFAA / benzene / 20 h / Ambient temperature 4: 74 percent / NaBH4, NiCl2*6H2O / methanol; tetrahydrofuran / 0.5 h / Ambient temperature 5: 87 percent / tetrahydrofuran / 2 h / Heating View Scheme

1: 96 percent / pyridine / 16 h / Ambient temperature 2: 93 percent / aq. NaIO4 / methanol / 20 h / Ambient temperature View Scheme