Method for producing bicyclic 1,3-diketones
    21.
    发明授权
    Method for producing bicyclic 1,3-diketones 失效
    双环1,3-二酮的制备方法

    公开(公告)号:US06815563B2

    公开(公告)日:2004-11-09

    申请号:US10332034

    申请日:2003-01-06

    IPC分类号: A01N4358

    摘要: A process for preparing bicyclic 1,3-diketones of the formula I where R1, R2, R3 and R4 are hydrogen, C1-C4-alkyl, C1-C4-alkoxy-carbonyl, halogen, cyano, nitro, C1-C4-alkylthio, C1-C4-alkylsulfenyl or C1-C4-alkylsulfonyl and Z is C1-C4-alkylene, O, S, N—R5 where R5 is C1-C4-alkyl or C1-C4-alkylcarbonyl, which comprises a) reacting a bicyclic olefin of the formula II with haloform in the presence of a base to give the ring-expanded product of the formula III  where R1-R4 and Z are as defined above and X is halogen; b) hydrolyzing the allylic halogen of the compound of the formula III to the allyl alcohol of the formula IV c) oxidizing the allyl alcohol of the formula IV to the unsaturated ketone of the formula V d) reacting the ketone of the formula V with a nucleophilic ion Y− which stabilizes a negative charge to give the ketone of the formula VI e) hydrolyzing the ketone of the formula VI to the bicyclic 1,3-diketone of the formula I, novel intermediates and novel processes for preparing these intermediates are described.

    摘要翻译: 制备式I其中R 1,R 2,R 3和R 4的双环1,3-二酮的方法是氢,C 1 -C 4 - 烷基,C 1 -C 4 - 烷氧基 - 羰基,卤素 氰基,硝基,C 1 -C 4 - 烷硫基,C 1 -C 4烷基硫基或C 1 -C 4 - 烷基磺酰基,Z是C 1 -C 4 - 亚烷基,O,S,NR 5,其中R 5是C 1 -C 4烷基或C 1 -C4 - 烷基羰基,其包括a)在碱存在下使式II的双环烯烃与卤代甲基反应,得到式III的环扩展产物,其中R 1 -R 4和Z如上所定义,X和X 将式III的化合物的烯丙基卤水解成式IVc的烯丙醇,将式Ⅳ的烯丙醇氧化为式ⅤⅤ的不饱和酮)使式Ⅴ的酮与 使负电荷稳定以得到式VIe的酮)将式VI的酮水解成式I的双环1,3-二酮的新型中间体和新方法 描述这些中间体。