Process for the preparation of 5-amino-4,6-dihalopyridines
The present invention relates to a process for the preparation of 5-amino-4,6-dihalopyridine derivatives of the formula I in which R represents hydrogen, -O-R or -NHR , R represents hydrogen or halogen, R represents hydrogen, or together with R represents =O, R represents hydrogen or alkyl, R repres...
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| Format: | Patent |
| Sprache: | eng ; ger |
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| Zusammenfassung: | The present invention relates to a process for the preparation of 5-amino-4,6-dihalopyridine derivatives of the formula I in which R represents hydrogen, -O-R or -NHR , R represents hydrogen or halogen, R represents hydrogen, or together with R represents =O, R represents hydrogen or alkyl, R represents hydrogen, alkyl, haloalkyl or aryl, R represents alkyl, R represents alkyl, cycloalkyl, aralkyl, aryl or heterocyclyl, each of which can optionally be substituted, R represents acyl or hydrogen, Hal represents halogen, characterised in that compounds of the formula II are halogenated with hydrohalic acids in the presence of oxidants. The present invention furthermore relates to the novel 5-aminopyridines of the formula III and to their preparation.c |
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