Process for preparing optically active allophenylnorstatin derivatives
    1.
    发明授权
    Process for preparing optically active allophenylnorstatin derivatives 失效
    制备光学活性异恶唑诺他抑素衍生物的方法

    公开(公告)号:US5581007A

    公开(公告)日:1996-12-03

    申请号:US609619

    申请日:1996-03-01

    摘要: A process for preparing an optically active (2S,3S)-allophenylnorstatin derivative (I) is disclosed, comprising asymmetrically hydrogenating a 4-phenyl-2-halogeno-3-oxobutyric ester (III) in the presence of a ruthenium-phosphine complex to obtain a 4-phenyl-(2S)-halogeno-(3R)-hydroxybutyric ester (IV), epoxidizing the ester (IV) in the presence of a base to obtain a 4-phenyl-(2S,3R)-epoxybutyric ester (V), reacting the ester (V) with a tri(lower alkyl)silylazide or a (lower alkyl)diarylsilylazide in the presence of a Lewis to obtain a (3S)-azido-4-phenyl-(2S)-trisubstituted silyloxybutyric ester (VI), hydrogenolyzing the ester (VI) into a (2S,3S)-allophenylnorstatin derivative (VII), protecting the amino group of the compound (VII), and, if desired, hydrolyzing the compound before or after the amino group protection. Compounds (I) can be obtained at high optical purity safely and in good yield.

    摘要翻译: 公开了一种制备光学活性(2S,3S) - 萘基异步抑制素衍生物(I)的方法,包括在钌膦络合物存在下不对称氢化4-苯基-2-卤代-3-氧代丁酸酯(III) 得到4-苯基 - (2S) - 卤素 - (3R) - 羟基丁酸酯(IV),在碱的存在下使酯(Ⅳ)环氧化,得到4-苯基 - (2S,3R) - 环氧丁酸酯 V),在路易斯存在下使酯(V)与三(低级烷基)甲硅烷基叠氮化物或(低级烷基)二芳基甲硅烷基叠氮化物反应,得到(3S) - 叠氮基-4-苯基 - (2S) - 三取代的甲硅烷氧基丁酸酯 (Ⅵ),将酯(Ⅵ)氢解成(2S,3S) - 萘基异步抑制素衍生物(Ⅶ),保护化合物(Ⅶ)的氨基,如果需要,在氨基保护之前或之后水解化合物 。 化合物(I)可以安全且高收率地获得高光学纯度。

    Keratin fiber strengthening agent and method for strengthening keratin fiber
    8.
    发明授权
    Keratin fiber strengthening agent and method for strengthening keratin fiber 失效
    角蛋白纤维增强剂及加强角蛋白纤维的方法

    公开(公告)号:US06379659B1

    公开(公告)日:2002-04-30

    申请号:US09193731

    申请日:1998-11-17

    IPC分类号: A61K706

    CPC分类号: A61K8/68 A61Q5/04

    摘要: A keratin fiber strengthening agent comprising 0.001 to 20% by weight of at least one (2S,3R)-2-acylaminoalkane-1,3-diol represented by formula (I): wherein R1 represents a straight-chain alkyl group having 9 to 17 carbon atoms; and R2 represents an acyl group having 2 to 24 carbon atoms which may contain at least one hydroxy group or unsaturated bond is disclosed. A method for improving physical properties, such as breaking strength, of keratin fiber such as hair comprising applying the keratin fiber strengthening agent to keratin fiber by adhesion, coating or impregnation is also disclosed.

    摘要翻译: 一种角蛋白纤维增强剂,其包含0.001至20重量%的由式(I)表示的至少一种(2S,3R)-2-酰基氨基烷-1,3-二醇:其中R1表示直链烷基,其具有9至 17个碳原子; 并且R 2表示可以含有至少一个羟基或不饱和键的碳原子数为2〜24的酰基。 还公开了用于改善角蛋白纤维如头发的物理性能如断裂强度的方法,其包括通过粘附,涂覆或浸渍将角蛋白纤维增强剂施用于角蛋白纤维。