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    • 8. 发明公开
    • 피리다진 제초제의 제조방법
    • 吡嗪类除草剂的生产
    • KR1020000052700A
    • 2000-08-25
    • KR1019997003493
    • 1997-10-16
    • 스미또모 가가꾸 가부시끼가이샤
    • 후루까와다까시
    • C07C251/76
    • C07D263/58C07C251/76C07D237/14C07D265/36
    • PURPOSE: Provided is a production method of pyridazine herbicides, and more particularly, the carboxylic acids are useful as intermediates for the production of pyridazin-3-one derivatives. Also provided are a process for producing these intermediates, and a process for producing pyridazin-3-one derivatives from these intermediates. CONSTITUTION: Carboxylic acids are represented by formula (1) wherein R¬2 and R¬3 are independently hydrogen or C1-C3 alkyl, and Q is optionally substituted phenyl, can be easily converted by ring closing into pyridazin-3-one derivatives of formula (7). The carboxylic acids of formula (1) can be produced by reacting hydrazone compounds of formula (5), wherein R¬3 and Q are as defined above, with malonic acid derivatives of the formula R¬2CH(COOH)2, wherein R¬2 is as defined above, in the presence of a base.
    • 目的:提供哒嗪除草剂的制备方法,更具体地说,羧酸可用作制备哒嗪-3-酮衍生物的中间体。 还提供了制备这些中间体的方法,以及从这些中间体制备哒嗪-3-酮衍生物的方法。 构成:羧酸由式(1)表示,其中R 2和R 3独立地是氢或C 1 -C 3烷基,Q是任选取代的苯基,可以容易地通过闭环转化成哒嗪-3-酮衍生物 公式(7)。 式(1)的羧酸可以通过使式(5)的腙化合物(其中R 3和Q如上定义)与式R 2 CH(COOH)2的丙二酸衍生物反应来制备,其中R 2如上所定义,在碱的存在下。