potassium carbonate in nitrobenzene T=190°C; 4 h;

potassium carbonate in nitrobenzene T=190°C; 3 h; Further catalysts;

potassium carbonate in nitrobenzene T=190°C; 4 h;

1: 41 g / SOCl2 / 3 h / Heating 2: 34 g / NaN3 / H2O; acetone / 1.) 5 deg C , 30 min , 2.) RT , 1 h 3: 3.6 g / toluene / 4 h / Heating 4: 6.7 g / Pyridine / benzene / 3 h / 50 - 60 °C 5: 0.1 g / anhydrous K2CO3 / nitrobenzene / 3 h / 190 °C / Further catalysts View Scheme

1: 10 g / dioxane; H2O / 1.) 15 deg C , 2 h , 2.) RT , overnight 2: 0.8 g / PCl5 / chlorobenzene / 2 h / Heating 3: 6.7 g / Pyridine / benzene / 3 h / 50 - 60 °C 4: 0.1 g / anhydrous K2CO3 / nitrobenzene / 3 h / 190 °C / Further catalysts View Scheme

1: 6.7 g / Pyridine / benzene / 3 h / 50 - 60 °C 2: 0.1 g / anhydrous K2CO3 / nitrobenzene / 3 h / 190 °C / Further catalysts View Scheme