PROCESS FOR THE PREPARATION OF 4-AMINO-5-FLUORO-3-CHLORO-6-(SUBSTITUTED)PICOLINATES
    2.
    发明申请
    PROCESS FOR THE PREPARATION OF 4-AMINO-5-FLUORO-3-CHLORO-6-(SUBSTITUTED)PICOLINATES 审中-公开
    制备4-氨基-5-氟-3-氯代-6-(取代的)吡啶甲酸酯的方法

    公开(公告)号:WO2014093580A1

    公开(公告)日:2014-06-19

    申请号:PCT/US2013/074575

    申请日:2013-12-12

    CPC classification number: C07D213/79 C07C251/12 C07D213/803

    Abstract: 4-Amino-5-fluoro-3-chloro-6-(substituted)picolinates are prepared from trifluoroacetic acid, p-methoxyaniline, a C1-C4 alkyl propiolate and a substituted methylene amine by a series of steps. In particular, provided herein are processes for the preparation of 4-amino-5-fluoro-3-chloro-6-(substituted)picolinates from a non-pyridine source without a metal assisted coupling and without fluorination with an expensive fluorinating agent. These picolinates are useful as herbicides.

    Abstract translation: 4-氨基-5-氟-3-氯-6-(取代的)吡啶甲酸盐通过一系列步骤由三氟乙酸,对甲氧基苯胺,C 1 -C 4烷基丙炔酸酯和取代的亚甲基胺制备。 特别地,本文提供的是从非吡啶源制备4-氨基-5-氟-3-氯-6-(取代的)吡啶甲酸盐的方法,没有金属辅助偶合而不用昂贵的氟化剂氟化。 这些吡啶甲酸盐作为除草剂是有用的。

    PROCESS FOR THE PREPARATION OF 4-ALKOXY-3-HYDROXYPICOLINIC ACIDS
    6.
    发明申请
    PROCESS FOR THE PREPARATION OF 4-ALKOXY-3-HYDROXYPICOLINIC ACIDS 审中-公开
    制备4-烷氧基-3-羟基吡啶酸的方法

    公开(公告)号:WO2016007638A1

    公开(公告)日:2016-01-14

    申请号:PCT/US2015/039569

    申请日:2015-07-08

    CPC classification number: C07D213/803 C07D213/79 C07D213/84 C07D307/54

    Abstract: 4,6-Dibromo-3-hydroxypicolinonitrile may be prepared from furfural in a series of chemical steps selected from cyano-amination, amine salt formation and bromination-rearrangement. 4-Alkoxy-3-hydroxypicolinic acids may be conveniently prepared from 4,6-dibromo-3-hydroxypicolinonitrile in a series of chemical steps selected from bromo substitution, nitrile hydrolysis and halogen reduction.

    Abstract translation: 4,6-二溴-3-羟基吡啶-2-腈可以由选自氰基胺化,胺盐形成和溴化重排的一系列化学步骤中的糠醛制备。 在一系列选自溴取代,腈水解和卤素还原的化学步骤中,可以方便地从4,6-二溴-3-羟基吡啶-2-腈制备4-烷氧基-3-羟基吡啶甲酸。

    PROCESS FOR THE PREPARATION OF 4,5,6-TRICHLOROPICOLINIC ACID
    8.
    发明申请
    PROCESS FOR THE PREPARATION OF 4,5,6-TRICHLOROPICOLINIC ACID 审中-公开
    制备4,5,6-三氯肉桂酸的方法

    公开(公告)号:WO2016022623A1

    公开(公告)日:2016-02-11

    申请号:PCT/US2015/043707

    申请日:2015-08-05

    CPC classification number: C07D213/803 B01J31/1815 B01J2531/847

    Abstract: 4,5,6-Trichloropicolinic acid is prepared by selectively dechlonnating 3,4,5,6- tetrachloropicolinic acid with zinc and a catalyst prepared from a nickel compound and a bidentate ligand in a polar solvent. A process for the preparation of 4,5,6-trichloro-picolinic acid by the regioselective reductive dechlorination of 3,4,5,6-tetrachloropicolinic acid is provided. More particularly, the process is described for the preparation of 4,5,6-trichloropicolinic acid (Formula I) which comprises selectively dechlonnating 3,4,5,6-tetrachloropicolinic acid (Formula II) with zinc and a catalyst prepared from a nickel compound and a bidentate ligand in a polar solvent.

    Abstract translation: 通过选择性地将3,4,5,6-四氯吡啶甲酸与锌和由极性溶剂中的镍化合物和二齿配体制备的催化剂进行选择性脱除制备4,5,6-三氯吡啶甲酸。 提供了通过区域选择性还原脱氯3,4,5,6-四氯吡啶甲酸制备4,5,6-三氯吡啶甲酸的方法。 更具体地,描述了用于制备4,5,6-三氯吡啶甲酸(式I)的方法,其包括选择性地使3,4,5,6-四氯吡啶甲酸(式II)与锌和由镍制备的催化剂 化合物和二齿配体在极性溶剂中。

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