selenium(IV) oxide in 1,4-dioxane 1 h; Heating;

chloranil in o-xylene 0.333333 h; Heating;

1: 79 percent / imidazole / dimethylformamide / 20 h / Ambient temperature 2: 87 percent / SeO2 / dioxane / 1 h / Heating View Scheme

1: 82 percent / pyridine / 24 h / -20 °C 2: 51 percent / CH3ONa / methanol / 2 h / Heating 3: 51 percent / triethyl phosphite / acetonitrile / 10 h / Irradiation 4: 79 percent / imidazole / dimethylformamide / 20 h / Ambient temperature 5: 87 percent / SeO2 / dioxane / 1 h / Heating View Scheme

1: 79 percent / imidazole / dimethylformamide / 20 h / Ambient temperature 2: 87 percent / SeO2 / dioxane / 1 h / Heating View Scheme

1: 51 percent / triethyl phosphite / acetonitrile / 10 h / Irradiation 2: 79 percent / imidazole / dimethylformamide / 20 h / Ambient temperature 3: 87 percent / SeO2 / dioxane / 1 h / Heating View Scheme

1: 51 percent / CH3ONa / methanol / 2 h / Heating 2: 51 percent / triethyl phosphite / acetonitrile / 10 h / Irradiation 3: 79 percent / imidazole / dimethylformamide / 20 h / Ambient temperature 4: 87 percent / SeO2 / dioxane / 1 h / Heating View Scheme