ES372228A1 - Procedure for the preparation of aminopyridinic derivatives. (Machine-translation by Google Translate, not legally binding)
- Google Patents
Procedure for the preparation of aminopyridinic derivatives. (Machine-translation by Google Translate, not legally binding)
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Antonio Gallardo SA
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Antonio Gallardo SA
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Procedure for the preparation of aminopyridine derivatives, of the general formula **(See formula)** where R1 represents an alkylaromatic and/or alkoxyaromatic, cyclic or heterocyclic radical, substituted or unsubstituted; and especially, when R1 is a substituted radical, the substitution radicals are preferably -CH3 (methyl), halogen, -OCH3 (methoxy), -OCH2-CH3, (ethoxy), (see formula) (N-oxyethyl-diethylamino) -NHOC-CH3 (acetamido), -OCH2-COOH (ethoxyacetic), -0C6H5 (phenoxy), -OC-CH3 (acetoxy); and R2 is a lower alkyl radical, characterized by reacting, at elevated temperature, in a suitable solvent medium, or, without solvents, by melting the reactants, a 2-amino-pyridine, of the formula **(See formula)** where R2 has the significance already stated, with an organic acid ester, preferably a phenyl ester, or with an excess of organic acid chloride or anhydride; with subsequent precipitation of the reaction product over ethanol or over water, washing and subsequent purification by recrystallization. (Machine-translation by Google Translate, not legally binding)
ES372228A1969-10-061969-10-06Procedure for the preparation of aminopyridinic derivatives. (Machine-translation by Google Translate, not legally binding)
ExpiredES372228A1
(en)
Improvements in the manufacture of intermediates for the production of dyes, in the manufacture of polymethin dyes and in photographic silver salt emulsions containing such dyes
Procedure to prepare derivatives of the acid tricloroacetamido-7 desacetoxi-3-cefalosporanico. (Machine-translation by Google Translate, not legally binding)