1: 90 percent / pyridine / dimethylformamide / 2 h / 20 °C 2: 0.230 g / methanol; tetrahydrofuran / 26 h / 20 °C 3: 76 percent / 48percent aq. HBr / 7 h / 120 °C 4: 98 percent / DMAP; Et3N / CH2Cl2 / 0.5 h / 20 °C 5: 51 percent / NBS; dibenzoyl peroxide / CCl4 / 3.83 h / 85 °C / Irradiation 6: 73 percent / 2,6-lutidine / dimethylformamide / 5.5 h / 120 °C 7: 80 percent / aq. NaOH / tetrahydrofuran / 1 h / 20 °C 8: 94 percent / Et3N / CH2Cl2 / 0.92 h 9: 77 percent / CH2Cl2 / 2.5 h / 20 °C 10: 0.142 g / TFA / CH2Cl2 / 0.92 h / 20 °C 11: PyBOP; diisopropylethylamine / dimethylformamide / 3 h View Scheme

1: 90 percent / pyridine / dimethylformamide / 2 h / 20 °C 2: 0.230 g / methanol; tetrahydrofuran / 26 h / 20 °C 3: 76 percent / 48percent aq. HBr / 7 h / 120 °C 4: 98 percent / DMAP; Et3N / CH2Cl2 / 0.5 h / 20 °C 5: 51 percent / NBS; dibenzoyl peroxide / CCl4 / 3.83 h / 85 °C / Irradiation 6: 73 percent / 2,6-lutidine / dimethylformamide / 5.5 h / 120 °C View Scheme

1: 90 percent / pyridine / dimethylformamide / 2 h / 20 °C 2: 0.230 g / methanol; tetrahydrofuran / 26 h / 20 °C 3: 76 percent / 48percent aq. HBr / 7 h / 120 °C 4: 98 percent / DMAP; Et3N / CH2Cl2 / 0.5 h / 20 °C View Scheme

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