1: 90 percent / DMAP / 3 h / 80 °C 2: 90 percent / pyridine / dimethylformamide / 2 h / 20 °C 3: 0.230 g / methanol; tetrahydrofuran / 26 h / 20 °C 4: 76 percent / 48percent aq. HBr / 7 h / 120 °C 5: 98 percent / DMAP; Et3N / CH2Cl2 / 0.5 h / 20 °C 6: 51 percent / NBS; dibenzoyl peroxide / CCl4 / 3.83 h / 85 °C / Irradiation View Scheme

1: 0.230 g / methanol; tetrahydrofuran / 26 h / 20 °C 2: 76 percent / 48percent aq. HBr / 7 h / 120 °C 3: 98 percent / DMAP; Et3N / CH2Cl2 / 0.5 h / 20 °C 4: 51 percent / NBS; dibenzoyl peroxide / CCl4 / 3.83 h / 85 °C / Irradiation View Scheme

1: 98 percent / DMAP; Et3N / CH2Cl2 / 0.5 h / 20 °C 2: 51 percent / NBS; dibenzoyl peroxide / CCl4 / 3.83 h / 85 °C / Irradiation View Scheme

1: 76 percent / 48percent aq. HBr / 7 h / 120 °C 2: 98 percent / DMAP; Et3N / CH2Cl2 / 0.5 h / 20 °C 3: 51 percent / NBS; dibenzoyl peroxide / CCl4 / 3.83 h / 85 °C / Irradiation View Scheme

1.1: NaH / dimethylformamide / 0.02 h / 20 °C 1.2: 67 percent / dimethylformamide / 1 h / 20 °C 2.1: 51 percent / NBS; dibenzoyl peroxide / CCl4 / 3.83 h / 85 °C / Irradiation View Scheme