1: 89 percent / Et3N / tetrahydrofuran / 1.08 h / 0 °C 2: 77 percent / NaI, Zn / 1,2-dimethoxy-ethane / 8 h / Heating 3: 99 percent / 45percent HBr, glacial AcOH / 3 h / Heating View Scheme

1: 89 percent / Et3N / tetrahydrofuran / 1.08 h / 0 °C 2: 77 percent / NaI, Zn / 1,2-dimethoxy-ethane / 8 h / Heating View Scheme