Method for producing pyrazole compound
    93.
    发明授权
    Method for producing pyrazole compound 有权
    制备吡唑化合物的方法

    公开(公告)号:US09012657B2

    公开(公告)日:2015-04-21

    申请号:US14009483

    申请日:2012-06-18

    CPC classification number: C07D231/28 C07D231/14

    Abstract: A method for producing a pyrazole compound of the general formula (5) includes reacting a 2-acyl-3-aminoacrylic acid ester of the general formula (1) with a hydrazine of the general formula (4) in the presence of a base where R1, R2, R3 and R4 each independently represent an alkyl group wherein R5 represents an alkyl group or an aryl group wherein R1, R4 and R5 have the same meanings as above. It is possible by this production method to produce the 1,3-disubstituted pyrazol-4-carboxylic acid ester at a high yield and selectivity and with less discoloration.

    Abstract translation: 制备通式(5)的吡唑化合物的方法包括在碱的存在下使通式(1)的2-酰基-3-氨基丙烯酸酯与通式(4)的肼反应, R 1,R 2,R 3和R 4各自独立地表示烷基,其中R 5表示烷基或芳基,其中R 1,R 4和R 5具有与上述相同的含义。 通过这种制备方法可以以高产率和选择性和较少的变色产生1,3-二取代的吡唑-4-羧酸酯。

    Process for preparing 1-phenylpyrazoles
    96.
    发明授权
    Process for preparing 1-phenylpyrazoles 有权
    1-苯基吡唑的制备方法

    公开(公告)号:US08933246B2

    公开(公告)日:2015-01-13

    申请号:US13738230

    申请日:2013-01-10

    Applicant: BASF SE

    CPC classification number: C07D231/20 C07D231/14

    Abstract: The present invention to a process for preparing 1-phenylpyrazoles of the formula I in which each R1 is independently selected from chlorine, fluorine, alkyl, haloalkyl, alkoxy and haloalkoxy; n is 1, 2 or 3; each R2 is independently selected from cyano, nitro, halogen, alkyl, haloalkyl, alkoxy, haloalkoxy, alkylthio and alkoxycarbonyl; m is 0, 1 or 2; A is alkyl, aryl or aryl-C1-C4-alkyl, where A optionally bears 1, 2, 3 or 4 substituents comprising reacting a phenyl halide of the formula (II) with a pyrazole derivative of the formula (III) in which X is chlorine, iodine or bromine; and R1, n, R2, m and A are each as defined above, in the presence of a base and a catalytic system comprising a ligand and a metal compound selected from palladium compounds, iron compounds and copper compounds.

    Abstract translation: 本发明涉及一种制备式I的1-苯基吡唑的方法,其中每个R 1独立地选自氯,氟,烷基,卤代烷基,烷氧基和卤代烷氧基; n为1,2或3; 每个R 2独立地选自氰基,硝基,卤素,烷基,卤代烷基,烷氧基,卤代烷氧基,烷硫基和烷氧基羰基; m为0,1或2; A是烷基,芳基或芳基-C 1 -C 4烷基,其中A任选地带有1,2,3或4个取代基,包括使式(II)的苯基卤与式(III)的吡唑衍生物反应,其中X 是氯,碘或溴; 在碱和催化体系的存在下,R 1,n,R 2,m和A各自如上所定义,所述催化体系包含配体和选自钯化合物,铁化合物和铜化合物的金属化合物。

    Preparation of alkyl 3-difluoromethyl-1-methyl-1H-pyrazole-4-carboxylic acid ester
    100.
    发明授权
    Preparation of alkyl 3-difluoromethyl-1-methyl-1H-pyrazole-4-carboxylic acid ester 有权
    3-二氟甲基-1-甲基-1H-吡唑-4-甲酸烷基酯的制备

    公开(公告)号:US08871947B2

    公开(公告)日:2014-10-28

    申请号:US14145073

    申请日:2013-12-31

    Applicant: KingChem LLC

    Abstract: The present disclosure provides a novel and economically advantageous process for preparation of compounds of Formula I, such as alkyl 3-difluoromethyl-1-methyl-1H-pyrazole-4-carboxylic acid ester. The process includes acidification of the sodium enolate of alkyl difluoroacetoacetate by carbonic acid generated in situ by reacting carbon dioxide with water. The disclosure also includes promoting the ring closure reaction in which alkyl 2-alkomethylene-4,4-difluoro-3-oxobutyrate is reacted with methylhydrazine in two phase system with a weak base such as Na2CO3 or K2CO3.

    Abstract translation: 本公开内容提供了制备式I化合物的新颖且经济上有利的方法,例如3-二氟甲基-1-甲基-1H-吡唑-4-甲酸烷基酯。 该方法包括通过二氧化碳与水反应原位产生的碳酸来酸化二氟乙酰乙酸烷基酯的烯醇化钠。 本公开还包括促进闭环反应,其中2-烷基亚甲基-4,4-二氟-3-氧代丁酸烷基酯与二碱系中的甲基肼与弱碱如Na 2 CO 3或K 2 CO 3反应。

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