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    • 4. 发明申请
    • Process for the production of optically active compounds having substituents at the 2-position
    • 用于制备在2-位具有取代基的光学活性化合物的方法
    • US20060247458A1
    • 2006-11-02
    • US10546823
    • 2004-02-25
    • Shogo YamamotoToshihiro TakedaYoshihide FuseYasuyoshi Ueda
    • Shogo YamamotoToshihiro TakedaYoshihide FuseYasuyoshi Ueda
    • C07C319/02
    • C07B53/00C07B2200/07C07C51/363C07C319/14C07C57/58C07C323/56
    • The present invention provides a process for producing an optically active compound having a thio group at the 2-position important for manufacturing medicines. An optically active compound having a hydroxyl group at the 2-position is chlorinated with inversion of the configuration at the 2-position, and the resultant optically active compound having a chlorine atom at the 2-position is reacted with a metal thiolate to introduce a thio group with inversion of the configuration at the 2-position. This process is capable of minimizing racemization and producing an optically active compound having a thio group at the 2-position at low cost in high yield. When the optically active compound having a chlorine atom at the 2-position is reacted with the metal thiolate in coexistence with water in the reaction system, the optically active compound having a thio group at the 2-position with higher optical purity can be produced in higher yield. An optically active carboxylic acid having a thio group at the 2-position is crystallized in the presence of an aliphatic hydrocarbon solvent and/or a sulfur-containing solvent to effectively remove coexistent impurities such as an optical isomer and the like, thereby producing crystals of an optically active carboxylic acid having a thio group at the 2-position with higher purity.
    • 本发明提供了制造药物重要的2位具有硫基的光学活性化合物的方法。 在2-位上具有羟基的光学活性化合物用2-位反转形式进行氯化,所得2-位上具有氯原子的光学活性化合物与金属硫醇盐反应,引入 硫基与2-位配位反转。 该方法能够使外消旋化最小化,并以高产率以低成本制备在2-位具有硫基的光学活性化合物。 当反应体系中2-位上具有氯原子的光学活性化合物与金属硫醇盐在水中共存时,具有较高光学纯度的2位具有硫基的光学活性化合物可以在 更高的产量。 在脂肪族烃溶剂和/或含硫溶剂的存在下,在2-位具有硫基的光学活性羧酸结晶化,以有效除去共同的杂质如旋光异构体等,从而产生 在2-位具有较高纯度的具有硫基的光学活性羧酸。
    • 10. 发明申请
    • Process for production of optically active 2-halogeno-carboxylic acids
    • 光学活性2-卤代羧酸的制备方法
    • US20050176999A1
    • 2005-08-11
    • US10503264
    • 2003-02-04
    • Koki YamashitaToshihiro TakedaYasuyoshi Ueda
    • Koki YamashitaToshihiro TakedaYasuyoshi Ueda
    • C07C51/363C07C51/41C07C51/43C07C53/15C07C53/16
    • 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,光学活性的2-卤代羧酸是通过在疏水性有机溶剂和亚硝酸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,并且通过除去形成的2-羟基 - 溴代羧酸来抑制外消旋化 作为副产品; 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。