Etablissements Nativelle, S.a.

Piero Tedeschi

Giorgio Adembri

Maresco Marini

Fabio Ponticelli

1-AMINO-5-ALKOXY-PYRAZOLE COMPOUNDS OF THE FORMULA: ##EQU1## wherein R.sub.1 represents a lower alkyl group having 1 to 4 carbon atoms, R.sub.2 and R.sub.3, which may be identical or different, represent a hydrogen atom, a lower alkyl group, a phenyl group, a phenyl group substituted by one or more groups selected from lower alkyl, halogen, nitro and lower alkoxy; R.sub.4 represents an amino group, a mono-lower alkyl amino group or a di-lower alkyl amino group; as well as their salts with a mineral or organic acid. A method for the preparation thereof, consisting essentially in internally transforming, in the presence of hydrazine, a 5-hydrazino-isoxazole (or 5-halogenoisoxazole) derivative and alkylating the 5-hydroxy-derivative obtained with a suitable diazoalkane.

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Florence, Italy

Piero Tedeschi