1: 63 percent / pyridine / 48 h / 10 °C 2: 1.4 g / ethyl acetate / 2 h / Heating 3: 14.6 g / aq. Na2CO3 / methanol / 4 h 4: pyridine / 48 h / 10 °C 5: ethanol / 20 h / 140 °C View Scheme

1: 14.6 g / aq. Na2CO3 / methanol / 4 h 2: pyridine / 48 h / 10 °C 3: ethanol / 20 h / 140 °C View Scheme

1: 1.4 g / ethyl acetate / 2 h / Heating 2: 14.6 g / aq. Na2CO3 / methanol / 4 h 3: pyridine / 48 h / 10 °C 4: ethanol / 20 h / 140 °C View Scheme

in ethanol T=140°C; 20 h;