potassium carbonate in N,N-dimethyl-formamide 24 h; Ambient temperature;

1: 60 percent / benzoyl peroxide, N-bromosuccinimide / CCl4 / Ambient temperature 2: 96 percent / 5percent aq. KOH / ethanol; dioxane / 2 h / Ambient temperature 3: 65 percent / K2CO3 / dimethylformamide / 24 h / Ambient temperature View Scheme

1: 100 percent / pyridine / 23 h / 0 - 20 °C 2: 60 percent / benzoyl peroxide, N-bromosuccinimide / CCl4 / Ambient temperature 3: 96 percent / 5percent aq. KOH / ethanol; dioxane / 2 h / Ambient temperature 4: 65 percent / K2CO3 / dimethylformamide / 24 h / Ambient temperature View Scheme

1: 96 percent / 5percent aq. KOH / ethanol; dioxane / 2 h / Ambient temperature 2: 65 percent / K2CO3 / dimethylformamide / 24 h / Ambient temperature View Scheme