Process for the preparation of 2,6-pyridinedicarboxylic acid esters
    4.
    发明授权
    Process for the preparation of 2,6-pyridinedicarboxylic acid esters 失效
    2,6-吡啶二羧酸酯的制备方法

    公开(公告)号:US6103906A

    公开(公告)日:2000-08-15

    申请号:US38977

    申请日:1998-03-12

    CPC分类号: C07D213/803 C07D213/79

    摘要: A process for the preparation of 2,6-pyridinedicarboxylic acid esters of the general formula: ##STR1## wherein R.sup.1 is a C.sub.1 -C.sub.6 -alkyl group, a C.sub.3 -C.sub.6 -cycloalkyl group, an aryl group or an arylalkyl group, and R.sup.2 and R.sup.3 independently of one another are hydrogen or chlorine and R.sup.4 is hydrogen, a C.sub.1 -C.sub.6 -alkyl group, a C.sub.1 -C.sub.6 -alkoxy group or fluorine. The 2,6-pyridinedicarboxylic acid esters are obtained by reaction of the corresponding halopyridines with carbon monoxide and an alcohol of the general formula:R.sup.1 --OH IIIwherein R.sup.1 has the abovementioned meaning, in the presence of a base and of a complex of palladium with a bis-diphenylphosphine. 2,6-Pyridinedicarboxylic acid esters are intermediates for the preparation of compounds having anti-inflammatory action.

    摘要翻译: 制备通式如下的2,6-吡啶二羧酸酯的方法:其中R1是C1-C6-烷基,C3-C6-环烷基,芳基或芳基烷基,R2和R3独立地是 彼此是氢或氯,R4是氢,C1-C6-烷基,C1-C6-烷氧基或氟。 2,6-吡啶二羧酸酯是通过相应的卤代吡啶与一氧化碳和通式为R 1 -OH的醇反应得到的:其中R 1具有上述含义,在碱的存在下和钯与 双 - 二苯基膦。 2,6-吡啶二羧酸酯是制备具有抗炎作用的化合物的中间体。

    Method for preparing pyridine-2,3-dicarboxylic acid esters
    5.
    发明授权
    Method for preparing pyridine-2,3-dicarboxylic acid esters 失效
    制备吡啶-2,3-二羧酸酯的方法

    公开(公告)号:US07009058B1

    公开(公告)日:2006-03-07

    申请号:US09568993

    申请日:2000-05-11

    IPC分类号: C07D213/80 C07D213/803

    摘要: A method for preparing pyridine-2,3-dicarboxylic acid esters of the general formula: wherein R is C1-6-alkyl, C3-6-cycloalkyl, aryl or arylalkyl, and R1 to R3, independently of one another, represent hydrogen, C1-6-alkyl, fluorinated C1-6-alkyl, C1-6-alkoxy, (C1-6-alkoxy)-C1-6-alkyl or (C1-6-alkoxy)carbonyl. These esters are obtained from the corresponding 2,3-dichloropyridine, the corresponding alcohol ROH and carbon monoxide in the presence of a palladium-diphosphine complex and a weak base. Pyridine-2,3-dicarboxylic acid esters are herbicides or intermediates for the preparation of herbicides.

    摘要翻译: 制备以下通式的吡啶-2,3-二羧酸酯的方法:其中R是C 1-6 - 烷基,C 3-6 - 环烷基,芳基 或芳基烷基,R 1至R 3彼此独立地表示氢,C 1-6 - 烷基,氟化C

    Process for preparing pyridinecarboxylic esters
    6.
    发明授权
    Process for preparing pyridinecarboxylic esters 失效
    制备吡啶羧酸酯的方法

    公开(公告)号:US6162921A

    公开(公告)日:2000-12-19

    申请号:US399744

    申请日:1999-09-20

    摘要: A process for preparing pyridinecarboxylic esters of the general formula: ##STR1## wherein R.sup.1 is hydrogen, a C.sub.1 -C.sub.6 -alkyl group, a C.sub.1 -C.sub.4 -alkoxycarbonyl group or a C.sub.1 -C.sub.4 -alkoxymethyl group, R.sup.2 is a C.sub.1 -C.sub.4 -alkyl group and X is chlorine or bromine. The pyridinecarboxylic esters are obtained by reacting the corresponding 2,3-dihalopyridines with carbon monoxide and a C.sub.1 -C.sub.4 -alkanol in the presence of a weak base and a complex of palladium with a bis(diphenylphosphine). Pyridinecarboxylic esters are intermediates for preparing herbicides and drugs against fibrotic diseases.

    摘要翻译: 一种制备通式如下的吡啶羧酸酯的方法:其中R 1是氢,C 1 -C 6烷基,C 1 -C 4烷氧基羰基或C 1 -C 4烷氧基甲基,R 2是C 1 -C 4烷基和 X是氯或溴。 吡啶羧酸酯通过在弱碱和钯与双(二苯基膦)的络合物存在下,使相应的2,3-二卤代吡啶与一氧化碳和C 1 -C 4烷醇反应而获得。 吡啶羧酸酯是制备除草剂和抗纤维化疾病药物的中间体。

    Process for preparing pyridinecarboxylic esters
    8.
    发明授权
    Process for preparing pyridinecarboxylic esters 失效
    制备吡啶羧酸酯的方法

    公开(公告)号:US06169183A

    公开(公告)日:2001-01-02

    申请号:US09238506

    申请日:1999-01-27

    IPC分类号: C07D21330

    摘要: A process for preparing pyridinecarboxylic esters of the general formula: wherein R1 is hydrogen, a C1-6-alkyl group, a C1-4-alkoxycarbonyl group, a C1-4-alkoxymethyl group or a fluorinated C1-6-alkyl group, R2 is a C1-4-alkyl group and X is chlorine or bromine. The pyridinecarboxylic esters are obtained by reacing the corresponding 2,3-dihalopyridines with carbon monoxide and a C1-4-alkanol in the presence of a weak base and a complex of palladium with a bis(diphenylphosphine). Pyridinecarboxylic esters are intermediates for preparing herbicides and drugs against fibrotic diseases.

    摘要翻译: 一种制备通式如下的吡啶羧酸酯的方法:其中R1是氢,C1-6烷基,C1-4烷氧基羰基,C1-4烷氧基甲基或氟化C1-6烷基,R2 是C 1-4 - 烷基,X是氯或溴。 吡啶羧酸酯通过在弱碱和钯与双(二苯基膦)的络合物存在下,用一氧化碳和C 1-4链烷醇取代相应的2,3-二卤代吡啶而得到。 吡啶羧酸酯是制备除草剂和抗纤维化疾病药物的中间体。

    Procedure for producing formylimidazoles
    10.
    发明授权
    Procedure for producing formylimidazoles 失效
    甲酰咪唑的制备方法

    公开(公告)号:US06469178B2

    公开(公告)日:2002-10-22

    申请号:US10005283

    申请日:2001-12-05

    IPC分类号: C07D23322

    CPC分类号: C07D233/64

    摘要: A new process for the catalytic conversion of hydroxymethyl imidazoles to formylimidazoles is described. The reaction takes place in the presence of a peroxide. Formylimidazoles are important intermediate products for pharmaceutical substances.

    摘要翻译: 描述了将羟甲基咪唑催化转化成甲酰基咪唑的新方法。 反应在过氧化物的存在下进行。 甲酰咪唑是药物物质的重要中间产物。