1: iodine / dimethyl sulfoxide / 110 °C 2: 3,3-dimethyldioxirane / dichloromethane; acetone / 0 °C 3: acetic acid / water / 110 °C 4: potassium carbonate / N,N-dimethyl-formamide / 5 h / 20 °C 5: methanol; sodium methylate / 5 h / 20 °C 6: hydrogen; palladium(II) oxide hydrate / tetrahydrofuran; methanol / 6 h / 20 °C View Scheme

iodine in dimethyl sulfoxide T=110°C;

1: iodine / dimethyl sulfoxide / 110 °C 2: 3,3-dimethyldioxirane / dichloromethane; acetone / 0 °C 3: hydrogen; palladium(II) oxide hydrate / tetrahydrofuran; methanol / 3 h / 20 °C View Scheme

1: iodine / dimethyl sulfoxide / 110 °C 2: 3,3-dimethyldioxirane / dichloromethane; acetone / 0 °C View Scheme