1.1: thionyl chloride; triethylamine / dichloromethane / 1 h / 20 °C 2.1: sodium periodate; ruthenium trichloride / dichloromethane; water; acetonitrile / 2 h / 20 °C 3.1: tetra-(n-butyl)ammonium iodide; 1,8-diazabicyclo[5.4.0]undec-7-ene / toluene / 5 h / 70 °C / Reflux 3.2: 3 h / 22 °C 4.1: hydrogenchloride / tetrahydrofuran; water / 3 h 4.2: 1 h / Reflux View Scheme