T=0°C; Molverhaeltnis 1:1;

1: 1.) OsO4, NaIO4, 2.) oxalic acid / 1.) dioxane, water, diethyl ether, 90 min, 2.) methanol, water, steam bath, 1 h 2: NaBH3CN, acetic acid / ethanol / Ambient temperature 3: EtONa / ethanol / Ambient temperature View Scheme