1: 91 percent / aq. HCl / 1 h / Heating 2: 1.) chlorotrimethylsilane / 1) pyridine, room temperature; 2) pyridine, room temperature 3: sodium hydride / dimethylformamide / 24 h / Ambient temperature 4: methanol / Ambient temperature 5: bromotrimethylsilane / acetonitrile / Ambient temperature View Scheme