1: 62.3 percent / dimethylformamide / 360 h / Ambient temperature 2: 1) raney nickel/H2, acetic acid, 2) NaNO2/H2O, 1.5h 3: 84.6 percent / phosphorus oxychloride / 3 h / Heating 4: 35 percent / ethanol; triethylamine / 87 h / Irradiation 5: 48 percent / 4.5 h / Heating View Scheme

1: 62.3 percent / dimethylformamide / 360 h / Ambient temperature 2: 1) raney nickel/H2, acetic acid, 2) NaNO2/H2O, 1.5h 3: 84.6 percent / phosphorus oxychloride / 3 h / Heating 4: 35 percent / ethanol; triethylamine / 87 h / Irradiation 5: 4.5 h / Heating View Scheme

1: 62.3 percent / dimethylformamide / 360 h / Ambient temperature 2: 1) raney nickel/H2, acetic acid, 2) NaNO2/H2O, 1.5h 3: 84.6 percent / phosphorus oxychloride / 3 h / Heating 4: 2-methoxy-ethanol / 87 h / Irradiation View Scheme