sodium carbonate in ethanol; dichloromethane; ethyl acetate

1: 72 percent / ammonium nitrate / tetrahydrofuran / 120 h 2: 51 percent / EtONa / ethanol / 72 h / Heating 3: 96 percent / 1 N aq. HCl / 36 h / Heating 4: 85 percent / aq. HNO3 / 1.) RT, 10 min, 2.) 75 deg C, 12 min 5: 34 percent / POCl3, benzyltriethylammonium chloride / acetonitrile / 1.) 40 deg C, 30 min, 2.) reflux, 1 h 6: 81 percent / Et3N / ethanol / 3 h / Ambient temperature 7: 88 percent / SnCl2*2H2O / ethyl acetate / 1 h / 70 °C View Scheme