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PROCESS FOR THE PREPARATION OF CYCLIC 1,3- DIKETONE DERIVATIVES CARBONYLATED IN THE 2-POSITION
PROCESS FOR THE PREPARATION OF CYCLIC 1,3- DIKETONE DERIVATIVES CARBONYLATED IN THE 2-POSITION
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机译:2位羰基化的环状1,3-二酮衍生物的制备方法
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摘要
The present invention relates to a process for the preparation of compounds of formula (I), wherein the substituents are as defined in claim 1, by reacting a compound of formula (II), either with a chlorination or bromination agent or with a compound of formula (III) CI-SO2R9, R9 being C1-C4alkyl, C1-C4haloalkyl, phenyl or C1-C4alkyl-substituted phenyl, to form the compound of formula (IV), reacting the compound of formula (IV) with a compound of formula (V) M+-O--C(O)-Y wherein Y is as defined above and M+ is the hydrogen cation or an alkali metal ion, alkaline earth metal ion or ammonium ion, to form the compound of formula (VI) and treating that compound with a cyanide source in the presence of a base.
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