1: pyridine / 0.5 h / 20 °C 2: 15 percent / sodium carbonate / ethane-1,2-diol / 0.08 h / 170 °C View Scheme

1: pyridine / 0.5 h / 20 °C 2: 15 percent / sodium carbonate / ethane-1,2-diol / 0.08 h / 170 °C 3: 42 percent / 80percent hydrazine hydrate, KOH / ethane-1,2-diol / 1.5 h / 200 °C View Scheme

1: pyridine / 0.5 h / 20 °C 2: 15 percent / sodium carbonate / ethane-1,2-diol / 0.08 h / 170 °C 3: 42 percent / 80percent hydrazine hydrate, KOH / ethane-1,2-diol / 1.5 h / 200 °C 4: 1.) Na2CO3, hydroxylamine hydrochloride, 2.) Na, EtOH / 1.) ethanol, reflux, 168 h, 2.) reflux, 4 h View Scheme

1: With 1,1'-carbonyldiimidazole in tetrahydrofuran T=23°C; 2 h; Inert atmosphere; 2: With hydrazine in tetrahydrofuran T=23°C; 16 h; Inert atmosphere;

water; hydrazine hydrate