VERFAHREN ZUM HERSTELLEN VON DIFLUORACETESSIGS UREALKYLESTERN

    公开(公告)号:EP1644314B1

    公开(公告)日:2011-08-10

    申请号:EP04740053.6

    申请日:2004-06-18

    IPC分类号: C07C69/716 C07C67/30

    摘要: The invention relates to a three-stage method for producing 4, 4-difluoro-acetyl-acetic acid alkylesters. In a first stage, a reaction of 4-chloro-4, 4-difluoro-acetyl-acetic acid alkylesters with trialkyl-phosphites of formula (III) P(OR1)3 is carried out, wherein R1 is C1-C4 alkyl, the R1 groups can be identical or different for producing alkyl-phosphonic acid esters of formula (IV) which react with amine of formula (V) during a second stage, wherein R2 and R3 are hydrogen or C1-C4 alkyl independent of each other, or jointly CH2-CH2-O-CH2-CH2- for forming enamines of formula (VI), wherein R2 and R3 have already mentioned significance, said enamines being hydrolysed in the presence of an acid during a third stage.

    摘要翻译: 本发明涉及生产4,4-二氟 - 乙酰基 - 乙酸烷基酯的三阶段方法。 在第一阶段中,进行4-氯-4,4-二氟 - 乙酰基 - 乙酸烷基酯与式(III)P(OR 1)3的三烷基亚磷酸酯的反应,其中R 1为C 1 -C 4烷基, R 1基团可以相同或不同,用于制备式(IV)的烷基 - 膦酸酯,其在第二阶段与式(V)的胺反应,其中R 2和R 3彼此独立地为氢或C 1 -C 4烷基,或 用于形成式(VI)的烯胺,其中R 2和R 3具有已提及的意义,所述烯胺在第三阶段期间在酸的存在下水解。