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    • 6. 发明授权
    • Process for obtaining active L-.alpha.-amino carboxylic acids from
corresponding racemic d, L-.alpha.-amino carboxylic acids
    • 从相应的外消旋d,L-α-氨基羧酸获得活性的L-α-氨基羧酸的方法
    • US6114163A
    • 2000-09-05
    • US94321
    • 1998-06-16
    • Karlheinz DrauzAndreas BommariusMichael KarrenbauerGunter Knaup
    • Karlheinz DrauzAndreas BommariusMichael KarrenbauerGunter Knaup
    • C07C227/34C07C227/36C07C319/20C07C323/60C12P13/04C12P41/00C07C1/00
    • C12P41/007C07C227/34C07C227/36C07C319/20C12P13/04
    • The disclosure relates to a process for obtaining optically active L-.alpha.-aminocarboxylic acids from the corresponding racemic D,L,.alpha.-aminocarboxylic acids. The following steps are involved: (a) the D,L,.alpha.-aminocarboxylic acids are acetylated; (b) the N-acetyl-L-.alpha.-aminocarboxylic acid present in the mixture of N-acetyl-D,L,.alpha.-aminocarboxylic acids thus obtained is broken down enzymatically into the L-.alpha.-aminocarboxylic acid; (c) the L-.alpha.-aminocarboxylic acid is separated from the mixture, a quantity of a solution of N-acetyl-D(L)-.alpha.-aminocarboxylic acids and a quantity of acetate equivalent to the L-.alpha.-aminocarboxylic acid being retained; and (d) the N-acetyl-D(L)-.alpha.-aminocarboxylic acid is racemized and recycled for enzymatic breakdown. Known extraction processes involving steps (a) to (d) have the disadvantage of producing large quantities of salt. Specifically, the processes are far removed from the ideal equation, according to which one hundred percent of the acetic anhydride and the D,L,.alpha.-aminocarboxylic acids are converted to L-.alpha.-aminocarboxylic acids and acetic acid. Adjusting the retained solution from step (c) in such a way as to obtain a solution consisting essentially of N-acetyl-D-(L)-.alpha.-aminocarboxylic acid salt and free acetic acid in equilibrium with acetate and free N-acetyl-D(L)-.alpha.-aminocarboxylic acid and from which acetic acid is extracted by distillation makes it surprisingly easy to feed the solution formed as "mother liquor" following separation of the L-.alpha.-aminocarboxylic acid in the circuit and to achieve a materials balance as close as possible to the ideal.
    • 本公开涉及从相应的外消旋D,L,α-氨基羧酸获得光学活性的L-氨基羧酸的方法。 涉及以下步骤:(a)D,L,α-氨基羧酸被乙酰化; (b)将由此获得的N-乙酰基-D,L,α-氨基羧酸的混合物中存在的N-乙酰基-L-α-氨基羧酸酶促分解成L-氨基羧酸; (c)从混合物中分离出L-α-氨基羧酸,一定量的N-乙酰基-D(L)-α-氨基羧酸溶液和一定量的乙酸钠相当于L-氨基羧酸为 保留 和(d)N-乙酰基-D(L)-α-氨基羧酸被外消旋化并再循环用于酶分解。 涉及步骤(a)至(d)的已知提取方法具有产生大量盐的缺点。 具体来说,这些方法远远不能从理想方程中去除,根据其中百分之百的乙酸酐和D,L,α-氨基羧酸被转化成L-α-氨基羧酸和乙酸。 调节步骤(c)中保留的溶液,以获得基本上由N-乙酰基-D-(L)-α-氨基羧酸盐和游离乙酸与乙酸酯和游离N-乙酰基 - D(L)-α-氨基羧酸,通过蒸馏萃取乙酸,使得在电路中分离出L-α-氨基羧酸之后,使得形成为“母液”的溶液容易进料,并获得材料 平衡尽可能接近理想。