in methanol Ambient temperature;

1: With ammonium chloride in methanol; water 1 h; Reflux; 2: With phosphoric acid in methanol; water 4 h; Reflux; 3: With potassium hydroxide in methanol; water pH=9;

1: methanol / Ambient temperature 2: 71 percent / triethylamine / 3 h / Ambient temperature 3: 550 °C / 0 Torr View Scheme