PROCESS FOR MANUFACTURING 5-FORMYL-PYRIDINE-2,3-DICARBOXYLIC ACID ESTERS
    25.
    发明公开
    PROCESS FOR MANUFACTURING 5-FORMYL-PYRIDINE-2,3-DICARBOXYLIC ACID ESTERS 有权
    用于生产5-甲酰基吡啶-2,3-二羧酸酯

    公开(公告)号:EP2376472A1

    公开(公告)日:2011-10-19

    申请号:EP09764528.7

    申请日:2009-12-07

    Applicant: BASF SE

    CPC classification number: C07D213/80

    Abstract: A process for manufacturing a 5-formyl-pyridine-2,3-dicarboxylic acid ester (I) wherein Z is hydrogen or halogen; Z
    1 is hydrogen, halogen, cyano or nitro and R
    1 , R
    2 are independently C
    1 -C
    10 -alkyl, comprising the steps of (i) reacting a compound of formula (II), wherein the symbols are as in formula (I), with a nitrosation agent (III) R
    3 -O-N=O (III) wherein R
    3 is C
    1 -C
    8 -alkyl, in the presence of an alkali metal or alkaline earth metal alcoholates or carbonates in a polar aprotic solvent at a temperature of from -45 to 40°C, to obtain an oxime compound (IV) where Z, Z
    1 , R
    1 and R
    2 are as in formula (I), and (ii) reacting oxime compound (IV) with an aliphatic C
    1 -C
    10 -aldehyde in the presence of a Lewis acid at a temperature in the range of from 0 to 100°C. The compounds of formula (I) are useful intermediates in the synthesis of herbicidal imidazolinones, like imazamox.

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