Method of producing 1-alkyl-3-aryl-5-difluoromethoxy-1H-pyrazoles
    1.
    发明授权
    Method of producing 1-alkyl-3-aryl-5-difluoromethoxy-1H-pyrazoles 失效
    1-烷基-3-芳基-5-二氟甲氧基-1H-吡唑的制备方法

    公开(公告)号:US06897322B2

    公开(公告)日:2005-05-24

    申请号:US10250503

    申请日:2002-01-15

    IPC分类号: C07D231/20 C07D231/14

    CPC分类号: C07D231/20

    摘要: The invention relates to a method of preparing 1-alkyl-3-aryl-5-difluoromethoxy-1H-pyrazoles of the formula (I), wherein aryl represents a mono- or polysubstituted phenyl ring, and R1 represents C1-C4 alkyl. The inventive method is characterized by reacting, in a first reaction step, a β-ketoester of the general formula (II) with hydrazine and by successively reacting the reaction product obtained with chlorodifluoromethane and a compound R1-L, wherein R1 has the meanings indicated above and L represents the leaving group of a nucleophilic displacement reaction.

    摘要翻译: 本发明涉及制备式(I)的1-烷基-3-芳基-5-二氟甲氧基-1H-吡唑的方法,其中芳基表示单取代或多取代的苯环,R 1 >表示C 1 -C 4烷基。 本发明的方法的特征在于在第一反应步骤中使通式(II)的β-酮酯与肼反应,并将所得反应产物与氯二氟甲烷和化合物R 1 - L,其中R 1具有上述含义,L表示亲核置换反应的离去基团。