1: 95 percent / MgSO4, MgO / 1.25 h / Heating 2: K2CO3 / dimethylformamide / 2 h / 110 °C 3: 10percent aq. H2SO4 / Heating 4: 69 percent / TFA, 36 N H2SO4 / 3.5 h / 25 °C 5: 95 percent / BBr3 / CH2Cl2 / 3 h / 25 °C View Scheme

1: 40 percent / BH3 / tetrahydrofuran / 0.5 h / Heating 2: 69 percent / TFA, 36 N H2SO4 / 3.5 h / 25 °C 3: 95 percent / BBr3 / CH2Cl2 / 3 h / 25 °C View Scheme

1: K2CO3 / dimethylformamide / 2 h / 110 °C 2: 10percent aq. H2SO4 / Heating 3: 69 percent / TFA, 36 N H2SO4 / 3.5 h / 25 °C 4: 95 percent / BBr3 / CH2Cl2 / 3 h / 25 °C View Scheme

1: 10percent aq. H2SO4 / Heating 2: 69 percent / TFA, 36 N H2SO4 / 3.5 h / 25 °C 3: 95 percent / BBr3 / CH2Cl2 / 3 h / 25 °C View Scheme

1: pyridine, 12 N aq. HCl, tert-butylhydroquinone / 1.5 h / 125 °C 2: 86.4 percent / Br2 / CH2Cl2 / -5 - 0 °C 3: 95 percent / MgSO4, MgO / 1.25 h / Heating 4: K2CO3 / dimethylformamide / 2 h / 110 °C 5: 10percent aq. H2SO4 / Heating 6: 69 percent / TFA, 36 N H2SO4 / 3.5 h / 25 °C 7: 95 percent / BBr3 / CH2Cl2 / 3 h / 25 °C View Scheme

methanol; water; sodium hydrogencarbonate T=20°C; 0.25 h;