1: With formic acid ethyl ester in toluene T=20°C; 24 h; 2: With hydrazine monohydrochloride in methanol; water T=20°C; 12 h;

1: With hydrogenchloride in tetrahydrofuran; ethanol; water 0.0833333 h; 2: With hydrazine hydrate in tetrahydrofuran; ethanol; water 12 h; Reflux;