1.1: dimethylsulfide borane complex / tetrahydrofuran / 1.5 h / 0 - 20 °C 1.2: 1 h / 0 °C 2.1: pyridinium chlorochromate / dichloromethane / 2 h / 20 °C 3.1: acetic acid / methanol / 1 h / 0 - 20 °C 3.2: 3 h / 0 - 20 °C 4.1: 10 Pd/C; hydrogen / methanol / 10 h / 20 °C 5.1: Dess-Martin periodane; sodium hydrogencarbonate / dichloromethane / 3 h / 20 °C / |Inert atmosphere View Scheme

1.1: dimethylsulfide borane complex / tetrahydrofuran / 1.5 h / 0 - 20 °C 1.2: 1 h / 0 °C 2.1: pyridinium chlorochromate / dichloromethane / 2 h / 20 °C 3.1: acetic acid / methanol / 1 h / 0 - 20 °C 3.2: 3 h / 0 - 20 °C 4.1: 10 Pd/C; hydrogen / methanol / 10 h / 20 °C View Scheme