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    • 5. 发明公开
    • PROCESS FOR PRODUCING OPTICALLY ACTIVE AZETIDINE-2-CARBOXYLIC ACIDS
    • VERFAHREN ZUR HERSTELLUNG冯OPTISCH AKTIVEN AZETIDIN-2-CARBONSÄUREN
    • EP1193253A1
    • 2002-04-03
    • EP00927758.3
    • 2000-05-15
    • KANEKA CORPORATION
    • HONDA, TatsuyaNAGASHIMA, Nobuo
    • C07D207/273C07D205/04C07C227/22C07C229/20C07C227/16
    • C07D207/273C07C227/16C07C227/22C07C229/20C07D205/04
    • An optically active N-protected azetidine-2-carboxylic acid (5) can be produced by preparing an optically active 4-amino-2-halobutyric acid (3)
         by halogenating an optically active 3-hydroxy-2-pyrrolidinone (1) with inversion of configuration to prepare an optically active 3-halo-2-pyrrolidinone (2) followed by hydrolysis or
         by halogenating an optically active 4-amino-2-hydroxybutyric acid ester (6) with inversion of configuration to prepare an optically active 4-amino-2-halobutyric acid ester (7) followed by hydrolysis or
         by halogenating the compound (6) with inversion of configuration to prepare the compound (7), cyclizing the same to prepare the compound (2) followed by hydrolysis,
         further cyclizing the compound (3) followed by treating the reaction product with an amino group-protecting agent.
      The optical purity of the thus-obtained compound (5) can be improved further by recrystallization.
    • 光学活性的N-保护的氮杂环丁烷-2-羧酸(5)可以通过用光学活性的4-氨基-2-卤代丁酸(3)通过卤化光学活性的3-羟基-2-吡咯烷酮(1)与 反型构型以制备光学活性3-卤代-2-吡咯烷酮(2),随后水解或通过用反型构型卤化光学活性4-氨基-2-羟基丁酸酯(6)以制备光学活性4- 氨基-2-卤代丁酸酯(7),然后水解或通过反式构型化合物(6)进行卤化以制备化合物(7),使其环化以制备化合物(2),然后水解,进一步环化 化合物(3),然后用氨基保护剂处理反应产物,由此得到的化合物(5)的光学纯度可以通过重结晶进一步提高