tetraethylammonium p-toluenesulfonate; acetic acid; tert-butyl alcohol 1.) anodic oxidation (3.3 mA cm-1), room temperature, 2.) room temperature, 1 d;

1: 82.2 percent / Et4NOTs, HOAc, t-BuOH / 1.) anodic oxidation (3.3 mA cm-1), room temperature, 2.) room temperature, 1 d 2: K2CO3 / dimethylformamide / 75 - 80 °C 3: 2N aq. NaOH / 3 h / Heating 4: 83.8 percent / N-methyl-2-pyrrolidinone / 20 h / 100 °C View Scheme