Process for producing an optically active compound
    15.
    发明授权
    Process for producing an optically active compound 失效
    光学活性化合物的制造方法

    公开(公告)号:US07816541B2

    公开(公告)日:2010-10-19

    申请号:US12028360

    申请日:2008-02-08

    IPC分类号: C07D209/04

    CPC分类号: C07D209/18 C07D209/20

    摘要: The present invention provides a process for selectively producing an enantiomer at position 4 of an optically active compound in the cross aldol reaction of pyruvic acid and indole-3-pyruvic acid. The process comprises the step of reacting pyruvic acid with indole-3-pyruvic acid in the presence of an optically active α-amino acid containing a secondary amine and a metal ion.

    摘要翻译: 本发明提供了在丙酮酸和吲哚-3-丙酮酸的交叉醛醇反应中选择性地在光学活性化合物的第4位产生对映异构体的方法。 该方法包括在含有仲胺和金属离子的光学活性α-氨基酸存在下使丙酮酸与吲哚-3-丙酮酸反应的步骤。

    Process for producing γ-hydroxyamino acid derivatives and monatins
    17.
    发明授权
    Process for producing γ-hydroxyamino acid derivatives and monatins 失效
    用于生产γ-羟基氨基酸衍生物和monatins的方法

    公开(公告)号:US07329427B2

    公开(公告)日:2008-02-12

    申请号:US10397407

    申请日:2003-03-27

    IPC分类号: A23L1/236

    CPC分类号: C07D209/20 A23L27/31

    摘要: Dihydroisoxazole derivatives are conveniently converted to γ-hydroxyamino acid derivatives which are important as various synthetic intermediates by a catalytic hydrogenation reaction. High-purity monatins which may be used as sweeteners or ingredients thereof can be obtained by subjecting a 5-indolylmethyl-4,5-dihydroisoxazole-3,5-dicarboxylic acid to catalytic hydrogenation.

    摘要翻译: 二氢异恶唑衍生物方便地转化为γ-羟基氨基酸衍生物,它们通过催化氢化反应作为各种合成中间体是重要的。 可以用作甜味剂或其成分的高纯度monatins可以通过使5-吲哚基甲基-4,5-二氢异恶唑-3,5-二羧酸进行催化氢化而获得。

    Process for production of aspartyl dipeptide ester derivatives
    18.
    发明授权
    Process for production of aspartyl dipeptide ester derivatives 失效
    天冬氨酰二肽酯衍生物的制备方法

    公开(公告)号:US06822111B2

    公开(公告)日:2004-11-23

    申请号:US10286840

    申请日:2002-11-04

    IPC分类号: C07C22900

    CPC分类号: C07K5/06113 A23L27/32

    摘要: N-[N-[3-(phenyl having various substituent group(s) on the benzene ring)propyl]-L-&agr;-aspartyl]-L-phenylalanine 1-methyl ester derivatives, which are useful as sweeteners, may be conveniently produced on an industrial scale at a high yield by reductively alkylating aspartame with a 3-(phenyl having specified substituent group(s) on the benzene ring)-2-propenyl aldehyde and hydrogen in the presence of a catalyst and a base.

    摘要翻译: 丙基] -L-α-天冬氨酰基] -L-苯丙氨酸1-甲酯衍生物,它们可用于甜味剂,可以方便地使用,N- [N- [3-(苯环上具有各种取代基的苯基) 通过在催化剂和碱的存在下用3-(苯环上具有特定的取代基的苯基)-2-丙烯基醛和氢还原性地烷基化阿斯巴甜来以高产率工业生产。

    Substrate material for a magnetic head
    20.
    发明授权
    Substrate material for a magnetic head 失效
    用于磁头的基材

    公开(公告)号:US5914285A

    公开(公告)日:1999-06-22

    申请号:US918756

    申请日:1997-08-25

    IPC分类号: C04B35/56

    摘要: To provide a substrate material having characteristics suitable to a magnetic head for attaining high recording density. A substrate material for a magnetic head comprising a matrix phase of a carbide of one or more of Ti, W and Ta and a dispersion phase of an oxide of one or more of Al.sub.2 O.sub.3, CrO.sub.3, and ZrO.sub.2, in which the material comprises 60 to 95 vol % of the matrix phase of the carbide. Further, a single phase in which the ingredients of carbides as the matrix phase comprise (Ti.sub.j W.sub.m Ta.sub.n)C.sub.x is preferred. Further, oxygen and/or nitrogen may be solid-solubilized in the carbide MeC of the matrix phase wherein Me is one or more of Ti, W, and Ta.

    摘要翻译: 为了提供具有适于磁头的特性以获得高记录密度的基片材料。 一种用于磁头的衬底材料,其包括Ti,W和Ta中的一种或多种的碳化物的基质相和Al 2 O 3,CrO 3和ZrO 2中的一种或多种的氧化物的分散相,其中所述材料包含60至 95体积%的碳化物的基体相。 此外,作为基质相的碳化物成分优选为(TijWmTan)C x的单相。 此外,氧和/或氮可以固溶在基质相的碳化物MeC中,其中Me是Ti,W和Ta中的一种或多种。