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US 6,150,521 AGranted
Process for preparing 3-(1-hydroxyphenyl-1-alkoximinomethyl) dioxazines
AssigneeBayer Aktiengesellschaft
InventorsHerbert Gayer, Bernd Gallenkamp, Peter Gerdes, Ulrich Heinemann, Bernd-Wieland Kruger, Reinhard Lantzsch, Thomas Seitz, Uwe Stelzer
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Abstract
The present invention relates to a plurality of novel processes and novel intermediates for preparing 3-(1-hydroxyphenyl-1-alkoximinomethyl)dioxazines, which are known as intermediates for preparing compounds having fungicidal properties (WO 95-04728).
Claims6
A process for preparing a compound of the formula (I):
- in which
- A represents alkyl;
- R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently represent hydrogen, halogen, cyano, nitro, alkyl, alkoxy, alkylthio, alkylsulphinyl, alkylsulphonyl, halogenoalkyl, halogenoalkoxy, halogenoalkylthio, halogenoalkylsulphinyl or halogenoalkylsulphonyl;
- Z.sup.1, Z.sup.2, Z.sup.3 and Z.sup.4 independently represent hydrogen, alkyl, halogenoalkyl or hydroxyalkyl;
- or
- Z.sup.1 and Z.sup.2 or Z.sup.1 and Z.sup.3 or Z.sup.3 and Z.sup.4 together with the carbon atoms to which they are attached form a cycloaliphatic ring having 5 to 7 carbon atoms;
- said process comprising rearranging an O-hydroxyethyl-O'-methyl-benzofurandione dioxime of the formula (II):
- ##STR50## in which A, R.sup.1, R.sup.2, R.sup.3, R.sup.4, Z.sup.1, Z.sup.2, Z.sup.3 and Z.sup.4 have the meaning indicated above;
- said rearranging optionally being carried out in the presence of a diluent and optionally in the presence of an acid or a base.
6 more elements
Dependencies are inferred from the claim text.