N-bromosuccinmide in dichloromethane; toluene T=-78 - 20°C; 10 h; Title compound not separated from byproducts;

2: 72 percent / n-BuLi / tetrahydrofuran; hexane / 7 h / -78 - 20 °C 3: 88 percent / NaI, trimethylsilyl chloride / acetonitrile / 3 h / Ambient temperature View Scheme

With  hydrogenchloride in  methanol 3 h;  Heating;