1: pyridinium p-toluenesulfonate / dichloromethane / 24 h / 20 °C / |Inert atmosphere 2: ruthenium trichloride; sodium periodate / water; acetonitrile; ethyl acetate / 0.75 h / 0 - 20 °C 3: ion-exchange resin Lewatit K2611 / acetone / 1 h / 60 °C / |Microwave irradiation; |Inert atmosphere View Scheme