1: BF3*Et2O / 1.) 60 deg C, 2 h; 2.) 100 deg C, 2 h 2: POCl3 / pyridine / 2 h / Heating 3: 67 percent / S, 10percent Pd-C / various solvent(s) / 2 h / Heating 4: 67 percent / Br2 / CCl4 / 3 h / 60 °C / Irradiation 5: 1.25 h / 60 °C 6: 2N HCl / 0.08 h View Scheme

1: 67 percent / Br2 / CCl4 / 3 h / 60 °C / Irradiation 2: 1.25 h / 60 °C 3: 2N HCl / 0.08 h View Scheme

1: 67 percent / S, 10percent Pd-C / various solvent(s) / 2 h / Heating 2: 67 percent / Br2 / CCl4 / 3 h / 60 °C / Irradiation 3: 1.25 h / 60 °C 4: 2N HCl / 0.08 h View Scheme