1: 1percent HCl / ethanol / 0.5 h / 50 °C 2: 71.7 percent / pyridine / CH2Cl2 / Ambient temperature 3: 100 percent / toluene / 10 h / Heating 4: triethylamine / dimethylformamide / 3 h / Heating 5: triethylamine / dimethylformamide / 3 h / 130 °C 6: hydrogen / 5percent Pd-C / CH2Cl2 / 2 h 7: NaOH / H2O; ethanol / 8 h / Heating View Scheme