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    • 8. 发明授权
    • Process for production of optically active 2-halogeno-carboxylic acids
    • 光学活性2-卤代羧酸的制备方法
    • US07473803B2
    • 2009-01-06
    • US10503264
    • 2003-02-04
    • Koki YamashitaToshihiro TakedaYasuyoshi Ueda
    • Koki YamashitaToshihiro TakedaYasuyoshi Ueda
    • C07C53/19C07B39/00
    • C07C51/412C07C51/363C07C51/43C07C53/19
    • The invention provides processes for producing efficiently optically active 2-halogenocarboxylic acids useful in the preparation of drugs or the like and salts thereof with amines. Specifically, an optically active 2-halogenocarboxylic acid is produced by halogenating an optically active amino acid in water in the presence of a hydrophobic organic solvent and nitrous acid with the configuration retained and with the racemization inhibited through the removal of 2-hydroxy-bromocarboxylic acid formed as a by-product; the obtained optically active 2-halogenocarboxylic acid is transferred to an aqueous phase by converting it into a salt thereof with a base, followed by the removal of the organic phase; and the optically active 2-halogenocarboxylic acid is transferred again to an organic solvent phase, followed by the removal of the aqueous phase, whereby an optically active 2-halogenocarboxylic acid is obtained through the removal of a halogen component. Further, a high-quality salt of an optically active 2-halogenocarboxylic acid with an amine can be obtained by a crystallization method wherein the amine is added over the period of ½ hour or longer either continuously or in portions and/or wherein the crystallization solvent consists of a hydrophobic organic solvent and a hydrophilic organic solvent.
    • 本发明提供了可用于制备药物等的有效光学活性2-卤代羧酸的方法及其与胺的盐。 具体地说,光学活性2-卤代羧酸是通过在疏水性有机溶剂和亚硝酸的存在下在水中卤化光学活性氨基酸而形成的,其中保留了结构,并且通过除去2-羟基 - 溴羧酸,外消旋化被抑制 形成副产品; 将得到的光学活性2-卤代羧酸通过将其转化为其盐与碱反应,然后除去有机相,转移到水相中。 并将光学活性2-卤代羧酸再次转移到有机溶剂相中,然后除去水相,由此通过除去卤素组分获得光学活性的2-卤代羧酸。 此外,光学活性2-卤代羧酸与胺的高品质盐可以通过结晶方法获得,其中胺在连续或部分加入0.5小时或更久的时间内和/或其中结晶溶剂 由疏水性有机溶剂和亲水性有机溶剂构成。