1: ethyl acetate; formic acid ethyl ester With sodium ethanolate in toluene
T=20°C;
2: 5-amino-1H-pyrazole in ethanol
5 h; Reflux;
3: With hydrogenchloride in water
pH=1; Cooling;
Bodroux
Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1904 , vol. 138, p. 1428
Bulletin de la Societe Chimique de France, 1905 , vol. <3>33, p. 832