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    • 96. 发明公开
    • METHOD OF PRODUCING S-(-)-6-HYDROXY-2,5,7,8-TETRAMETHYLCHROMANE-2-CARBOXYLIC ACID AND PRODUCT OBTAINED BY THE METHOD
    • VERFAHREN ZUR HERSTELLUNG VON S - ( - ) - 6-羟基-2,5,7,8-四甲基嘧啶-2-碳
    • EP2088144A1
    • 2009-08-12
    • EP07830535.6
    • 2007-10-25
    • Mitsubishi Gas Chemical Company, Inc.
    • IIDA, AkifumiKYUUKO, YouichiHIDAKA, Toshio
    • C07D311/66C07B53/00
    • C07D311/66C07B53/00
    • The present invention provides an industrially available method for efficiently producing high-purit y S-(-)-6-hydroxy-2,5,7,8-tetramethylchromane-2-carboxylic acid excellent in solid-liquid separability from an S-(-)-6-hydroxy-2,5,7,8-tetramethylchromane-2-carboxylic acid ester, and also provides products obtained by the method.
      Under a temperature condition of 50-80°C in an aqueous solvent, (A) an S-(-)-6-hydroxy-2,5,7,8-tetramethylchromane-2-carboxylic acid ester represented by the general formula (1) is hydrolyzed under a basic condition for 1-3 hours; then (B) the insoluble matters contained in the reaction solution resulting from the hydrolysis are removed; and (C) an acid is added to the resulting solution to effect crystallization; provided that R in the general formula (1) represents an alkyl or aryl group.
    • 本发明提供了一种工业上可行的方法,用于有效地生产具有优异的固液分离性的高纯度的S - ( - ) - 6-羟基-2,5,7,8-四氢苯并二氢吡喃-2-羧酸, - ) - 6-羟基-2,5,7,8-四氢苯并二氢吡喃-2-羧酸酯,还提供通过该方法得到的产物。 在水性溶剂中在50-80℃的温度条件下,(A)由通式((A)表示的S - ( - ) - 6-羟基-2,5,7,8-四氢苯并二氢吡喃-2-羧酸酯 1)在碱性条件下水解1-3小时; 然后(B)除去由水解产生的反应溶液中所含的不溶物; 和(C)向所得溶液中加入酸以进行结晶; 条件是通式(1)中的R表示烷基或芳基。