1: K2CO3 / dimethylformamide 2: 171 mg / BCl3 / CH2Cl2 / 5 h / Ambient temperature 3: pyridine / 3 h / 90 °C 4: 1.) Br2, 2.) H2O / 1.) CCl4, reflux, 15 min, irradiation, 2.) dioxan, reflux, 4.5 h 5: 210 mg / pyridinium chlorochromate / CH2Cl2 / 3 h 6: 67 mg / LiI / hexamethylphosphoric acid triamide / 40 h / Heating View Scheme

1: K2CO3 / dimethylformamide 2: 1.) Br2, 2.) H2O / 1.) CCl4, reflux, 5 min, irradiation, 2.) dioxan, reflux, 4 h 3: 240 mg / BCl3 / CH2Cl2 / 4.5 h / Ambient temperature 4: toluene-p-sulphonic acid monohydrate / dimethylformamide / 82 h 5: 146 mg / pyridinium chlorochromate, sodium acetate / CH2Cl2 / 4 h 6: 59 mg / acetic acid (aq) / 24 h / Heating 7: 6.5 mg / LiI / hexamethylphosphoric acid triamide / 20 h / Heating View Scheme