3.
    发明专利
    未知

    公开(公告)号:DE59308002D1

    公开(公告)日:1998-02-26

    申请号:DE59308002

    申请日:1993-03-11

    Applicant: BASF AG

    Abstract: Isoxazole-3,4-dicarboxylic acid derivatives of the formula I … … in which the substituents have the following meanings: …… R denotes hydrogen, an alkyl, cycloalkyl or phenyl radical or a 5- to 6-membered heterocyclic radical, it being possible for the organic radicals to have substituents which are inert under the reaction conditions; … R denotes hydrogen, an alkyl, cycloalkyl, benzyl or C3-C6-alkenyl radical; … A denotes an amino group NR R in which R represents hydrogen or an aliphatic or cycloaliphatic radical and R denotes an aliphatic, cycloaliphatic or optionally substituted phenyl radical, or R together with R forms a 4- to 7-membered alkylene chain which can be interrupted by oxygen, sulphur or N-methyl, or denotes a group OR in which R represents an alkyl, cycloalkyl, benzyl or alkenyl radical; … are prepared by deprotonating a CH-acidic compound of the formula II … … by means of a base and reacting the product with hydroxamoyl chlorides of the formula III … … characterised in that the deprotonation is carried out using a magnesium alcoholate of the formula IV… Mg(OR )2IV… in which R denotes an aliphatic or cycloaliphatic radical.

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