hydrogen bromide; acetic acid T=0 - 20°C;

1: 98 percent / dimethylformamide / 3 h / Heating 2: 70 percent / EtOLi / ethanol / 8 h / Heating 3: 78 percent / H2 / Pd/C / CHCl3; methanol / 48 h / 20 °C 4: 75 percent / AlBr3; EtSH / 24 h / 20 °C View Scheme