1: pyridine / toluene / 5 h / Heating 2: AlCl3, NaCl / 2 h / 160 °C 3: potassium carbonate / dimethylformamide / 5 h 4: various solvent(s) / 4 h / Heating 5: H2 / PtO2 / acetic acid / 2206.5 Torr 6: HCl / ethanol / Heating 7: ethanol / 7 h / Heating 8: polyphosphoric acid / Heating 9: 1.) sodium hydride, 2.) HCl / 1.) DMF, RT, 24 h, 2.) reflux, 1 h 10: 0.1 M NaOH / methanol / 0.25 h / Heating View Scheme

water; boron tribromide in dichloromethane T=-70 - 20°C; 1.5 h;

1: 1.) sodium hydride / 1.) DMF, 2.) DMF, RT, 2 h 2: BBr3, H2O / CH2Cl2 / 1.5 h / -70 - 20 °C View Scheme

1.1: NaOMe / methanol / 0.08 h / 20 °C 1.2: 64 percent / K2CO3; CuI / dimethylformamide / 12 h / 140 °C 2.1: 8 percent / polyphosphoric acid / 16 h / 120 °C View Scheme

1: With sodium methylate in methanol T=20°C; 0.0833333 h; 2: With copper(l) iodide; potassium carbonate in N,N-dimethyl-formamide T=140°C; 12 h; Further stages.;

1: pyridine / toluene / 5 h / Heating 2: AlCl3, NaCl / 2 h / 160 °C 3: potassium carbonate / dimethylformamide / 5 h 4: various solvent(s) / 4 h / Heating 5: H2 / PtO2 / acetic acid / 2206.5 Torr 6: HCl / ethanol / Heating View Scheme