ammonium metavanadate; dihydrogen peroxide; acetic acid; potassium bromide 1 h; Ambient temperature;

1: 86 percent / pyridine / ethyl acetate / 18 h / 20 °C 2: 48 percent / glacial AcOH; Br2 / 1.5 h / 15 °C View Scheme

1: 94 percent / AcOH; conc. HCl / 24 h / 118 °C 2: 6.52 g / N-methylpyrrolidinone / 2 h / 163 °C 3: 93 percent / aq. KOH; H2O2 / 2 h / 130 °C 4: 97 percent / tetrahydrofuran / 6 h / 20 °C 5: 90 percent / DMAP / 3 h / 80 °C 6: 90 percent / pyridine / dimethylformamide / 2 h / 20 °C 7: 0.230 g / methanol; tetrahydrofuran / 26 h / 20 °C 8: 76 percent / 48percent aq. HBr / 7 h / 120 °C 9: 98 percent / DMAP; Et3N / CH2Cl2 / 0.5 h / 20 °C 10: 51 percent / NBS; dibenzoyl peroxide / CCl4 / 3.83 h / 85 °C / Irradiation 11: 73 percent / 2,6-lutidine / dimethylformamide / 5.5 h / 120 °C 12: 80 percent / aq. NaOH / tetrahydrofuran / 1 h / 20 °C 13: 94 percent / Et3N / CH2Cl2 / 0.92 h 14: 77 percent / CH2Cl2 / 2.5 h / 20 °C 15: 0.142 g / TFA / CH2Cl2 / 0.92 h / 20 °C 16: PyBOP; diisopropylethylamine / dimethylformamide / 3 h View Scheme

1: 94 percent / AcOH; conc. HCl / 24 h / 118 °C 2: 6.52 g / N-methylpyrrolidinone / 2 h / 163 °C 3: 93 percent / aq. KOH; H2O2 / 2 h / 130 °C 4: 97 percent / tetrahydrofuran / 6 h / 20 °C 5: 90 percent / DMAP / 3 h / 80 °C 6: 90 percent / pyridine / dimethylformamide / 2 h / 20 °C 7: 0.230 g / methanol; tetrahydrofuran / 26 h / 20 °C 8: 76 percent / 48percent aq. HBr / 7 h / 120 °C 9: 98 percent / DMAP; Et3N / CH2Cl2 / 0.5 h / 20 °C 10: 51 percent / NBS; dibenzoyl peroxide / CCl4 / 3.83 h / 85 °C / Irradiation 11: 73 percent / 2,6-lutidine / dimethylformamide / 5.5 h / 120 °C View Scheme

1: 94 percent / AcOH; conc. HCl / 24 h / 118 °C 2: 6.52 g / N-methylpyrrolidinone / 2 h / 163 °C 3: 93 percent / aq. KOH; H2O2 / 2 h / 130 °C 4: 97 percent / tetrahydrofuran / 6 h / 20 °C 5: 90 percent / DMAP / 3 h / 80 °C 6: 90 percent / pyridine / dimethylformamide / 2 h / 20 °C 7: 0.230 g / methanol; tetrahydrofuran / 26 h / 20 °C 8: 76 percent / 48percent aq. HBr / 7 h / 120 °C 9: 98 percent / DMAP; Et3N / CH2Cl2 / 0.5 h / 20 °C View Scheme

1: 94 percent / AcOH; conc. HCl / 24 h / 118 °C 2: 6.52 g / N-methylpyrrolidinone / 2 h / 163 °C View Scheme

hydrogenchloride; acetic acid T=118°C; 24 h;

1: 94 percent / AcOH; conc. HCl / 24 h / 118 °C 2: 6.52 g / N-methylpyrrolidinone / 2 h / 163 °C 3: 93 percent / aq. KOH; H2O2 / 2 h / 130 °C View Scheme

1: N-(2-bromo-5-chloro-4-methylphenyl)acetamide With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 2.75 h; 2: carbon dioxide in tetrahydrofuran; hexane T=-78 - 20°C;

1: 94 percent / AcOH; conc. HCl / 24 h / 118 °C 2: 6.52 g / N-methylpyrrolidinone / 2 h / 163 °C 3: 93 percent / aq. KOH; H2O2 / 2 h / 130 °C 4: 97 percent / tetrahydrofuran / 6 h / 20 °C 5: 90 percent / DMAP / 3 h / 80 °C 6: 90 percent / pyridine / dimethylformamide / 2 h / 20 °C 7: 0.230 g / methanol; tetrahydrofuran / 26 h / 20 °C 8: 76 percent / 48percent aq. HBr / 7 h / 120 °C 9: 98 percent / DMAP; Et3N / CH2Cl2 / 0.5 h / 20 °C 10: 51 percent / NBS; dibenzoyl peroxide / CCl4 / 3.83 h / 85 °C / Irradiation View Scheme