Process for preparing enantiomer-enriched amino- and hydroxyfuranones
    1.
    发明授权
    Process for preparing enantiomer-enriched amino- and hydroxyfuranones 失效
    制备富含对映异构体的氨基和羟基呋喃酮的方法

    公开(公告)号:US06417377B1

    公开(公告)日:2002-07-09

    申请号:US10044908

    申请日:2002-01-15

    IPC分类号: C07D30760

    CPC分类号: C07D307/60 C07D307/66

    摘要: A process for the preparation of enantiomer-enriched aminofuranones and hydroxyfuranones in which an enantiomer-enriched cyanohydrin is acylated by an acylating agent, then cyclized at 40 to 90° C. in the presence of zinc or a zinc compound to the corresponding enantiomer-enriched aminofuranone, which is converted where appropriate by acid hydrolysis into the corresponding enantiomer-enriched hydroxyfuranone.

    摘要翻译: 制备富含对映异构体的氨基呋喃酮和羟基呋喃酮的方法,其中富含对映异构体的氰醇被酰化剂酰化,然后在锌或锌化合物的存在下在40至90℃下环化成相应的对映体富集 氨基呋喃酮,其通过酸水解适当地转化成相应的富含对映异构体的羟基呋喃酮。

    Method for the production of optically active cyanohydrins using r-oxynitrilase
    4.
    发明授权
    Method for the production of optically active cyanohydrins using r-oxynitrilase 有权
    使用γ-氧硝腈酶制备光学活性氰醇的方法

    公开(公告)号:US06717006B1

    公开(公告)日:2004-04-06

    申请号:US10149186

    申请日:2002-06-10

    IPC分类号: C12P1300

    摘要: The invention relates to the production of (R)-enantiomeric, optically active cyanohydrins by reacting an aldehyde or a ketone with a cyanide group donor in the presence of (R) oxynitrilase, wherein a reaction mixture comprising a) an aldehyde or a ketone dissolved in an organic solvent; said organic solvent is immiscible or only slightly miscible with water, b) any aqueous R)-oxynitrilase solution and c) a cyanide group donor is stirred in such away that an emulsion is formed which remains intact until the end of the enzymatic reaction. After the enzymatic reaction has terminated, the (R)-cyanohydrin is isolated from the reaction mixture.

    摘要翻译: 本发明涉及通过使(R) - 对映异构的光学活性的氰醇的制备,其中在(R)硝基腈酶存在下使醛或酮与氰化物基团供体反应,其中反应混合物包含a)醛或酮溶解 在有机溶剂中; 所述有机溶剂是不混溶的或仅与水轻微混溶,b)任何R) - 氧腈腈水溶液溶液,和c)氰化物基团供体被搅拌,使得形成乳状液,直到酶反应结束为止。 酶反应终止后,从反应混合物中分离(R) - 氰基氢。

    Process for the preparation of optically and chemically highly pure (R)- or (S)-&agr;-hydroxycarboxylic acids
    6.
    发明授权
    Process for the preparation of optically and chemically highly pure (R)- or (S)-&agr;-hydroxycarboxylic acids 失效
    用于制备光学和化学高纯度(R) - 或(S)-α-羟基羧酸的方法

    公开(公告)号:US06781012B2

    公开(公告)日:2004-08-24

    申请号:US09834926

    申请日:2001-04-16

    IPC分类号: C07C5700

    CPC分类号: C07C51/08 C07C51/43 C07C59/56

    摘要: Process for the preparation of optically highly pure (R)- and (S)-&agr;-hydroxycarboxylic acids, in which either isolated, impure (R)- and (S)-&agr;-hydroxycarboxylic acids prepared by acidic hydrolysis of the (R)- and (S)- cyanohydrins obtained by enzyme-catalyzed addition of a cyanide group donor to the corresponding aldehydes or ketones are recrystallized in an aromatic hydrocarbon, optionally in the presence of a cosolvent, and optically highly pure (R)- and (S)-&agr;-hydroxycarboxylic acids having an optical purity of over 98%ee are obtained or the hydrolysis solution obtained by acidic hydrolysis of the (R)- and (S)-cyanohydrins is treated directly with an aromatic hydrocarbon, optionally in combination with a cosolvent, and is then extracted at hydrolysis temperature, whereupon after cooling of the organic phase the corresponding chemically and optically highly pure (R)- and (S)-&agr;-hydroxycarboxylic acids having an optical purity of over 98%ee crystallize out.

    摘要翻译: 用于制备光学高纯度(R) - 和(S)-α-羟基羧酸的方法,其中通过(R) - (S)-α-羟基羧酸的酸性水解制备的分离的,不纯的(R) - 和(S) - 和(S) - 氰醇,通过酶催化将氰化物基团供体加入到相应的醛或酮中,任选在助溶剂存在下,在芳族烃中重结晶,和光学上高纯度(R) - 和(S ) - 光学纯度超过98%ee的α-羟基羧酸,或者通过(R) - 和(S) - 氰基醇的酸性水解获得的水解溶液直接用芳烃处理,任选地与 共溶剂,然后在水解温度下提取,随后有机相冷却后,光学纯度超过98%ee的相应的化学和光学高纯度(R) - 和(S)-α-羟基羧酸结晶出来。

    Process for selective reduction
    8.
    发明授权
    Process for selective reduction 失效
    选择性还原的方法

    公开(公告)号:US06355822B1

    公开(公告)日:2002-03-12

    申请号:US09616875

    申请日:2000-07-14

    IPC分类号: C07F708

    摘要: Process for the stereoselective reduction of chiral &agr;- or &bgr;-keto esters which have a chiral center in the &ggr; position in an inert solvent at temperatures from −80 to +50° C. using a reductant obtained by reaction of NaBH4 and (D)- or (L)-tartaric acid, to give the corresponding diastereomeric hydroxy compounds in each case.

    摘要翻译: 使用NaBH 4和(D)的反应获得的还原剂,在-80至+ 50℃的温度下,在惰性溶剂中在γ位置具有手性中心的手性α-或β-酮酯的立体选择性还原方法, - 或(L) - 酒石酸,得到相应的非对映体羟基化合物。