1: 93.5 percent / aq. K2CO3 / acetone; methanol / 5 h / 50 °C 2: 89.9 percent / ethanol / 1 h / Heating 3: 51.45 percent / ammonia, NH4Cl / methanol / 15 h / 80 - 90 °C View Scheme

1: 93.5 percent / aq. K2CO3 / acetone; methanol / 5 h / 50 °C 2: 89.9 percent / ethanol / 1 h / Heating 3: 51.45 percent / ammonia, NH4Cl / methanol / 15 h / 80 - 90 °C 4: 81.8 percent / HCl / dimethylformamide / 48 h / 4 °C View Scheme

1: 93.5 percent / aq. K2CO3 / acetone; methanol / 5 h / 50 °C 2: 89.9 percent / ethanol / 1 h / Heating 3: 51.45 percent / ammonia, NH4Cl / methanol / 15 h / 80 - 90 °C 4: 81.8 percent / HCl / dimethylformamide / 48 h / 4 °C 5: 70.7 percent / methanol / 0.5 h / Ambient temperature View Scheme

1: 93.5 percent / aq. K2CO3 / acetone; methanol / 5 h / 50 °C 2: 89.9 percent / ethanol / 1 h / Heating 3: 51.45 percent / ammonia, NH4Cl / methanol / 15 h / 80 - 90 °C 4: 81.8 percent / HCl / dimethylformamide / 48 h / 4 °C 5: 67.5 percent / water / ethanol / 20 h / 40 °C View Scheme