1.1: potassium carbonate; sodium iodide / acetonitrile / 3 h / 20 °C / Reflux 2.1: potassium hexamethylsilazane / toluene / 1 h / 20 °C 2.2: 2.5 h / 20 °C 3.1: tetrabutyl-ammonium chloride; potassium carbonate / water; acetonitrile / 0.25 h / 20 °C 3.2: 24 h / 60 °C 4.1: sodium hydroxide / methanol; water / 3 h / 20 °C 4.2: 0.08 h View Scheme

sodium sulfide in N,N-dimethyl-formamide 30 h; Ambient temperature;

diisobutylaluminium hydride in n-heptane; dichloromethane T=0 - 20°C; Reduction; 3 h;

1.1: N,N-dimethyl-formamide / 50 °C 2.1: tetraethylammonium p-toluenesulfonate; triethylamine / acetonitrile / 0.08 h / 20 °C / Electrochemical reaction 2.2: 0.25 h / 0 °C 3.1: triethylsilane; boron trifluoride diethyl etherate / dichloromethane / 1.5 h / 0 °C 4.1: potassium hydrogensulfate / anhydrous xylene / 6 h / Reflux View Scheme