Process for producing cyclohexylbutyric acid derivative
    2.
    发明授权
    Process for producing cyclohexylbutyric acid derivative 失效
    环己基丁酸衍生物的制备方法

    公开(公告)号:US5442105A

    公开(公告)日:1995-08-15

    申请号:US175505

    申请日:1993-12-30

    摘要: A process for for producing a (2R,3S)-cyclohexylnorstatine or a salt thereof is disclosed, which comprises the steps of: enantioselectively hydrogenating a 4-cyclohexyl-2-halogeno-3-oxobutyric acid ester in the presence of a ruthenium-phosphine complex to produce a 4-cyclohexyl-2-halogeno-(3R)-hydroxybutyric acid ester (2); epoxidizing the compound (2) in the presence of a base to produce a 4-cyclohexyl-(2S,3R)-epoxybutyric acid ester (3); reacting the compound (3) with a lower trialkylsilyl azide in the presence of a Lewis acid to produce a (3S)-azide-4-cyclohexyl-(2S)-substituted butyric acid ester (4); subjecting the compound (4) to hydrogenolysis to produce a (2S,3S)-cyclohexylnorstatine derivative (5); and inverting the configuration at the 2-position of the compound (5).

    摘要翻译: 公开了一种制备(2R,3S) - 环己基异腈或其盐的方法,其包括以下步骤:在钌 - 磷化氢存在下对4-选择性氢化4-环己基-2-卤代-3-氧代丁酸酯 复合以制备4-环己基-2-卤代 - (3R) - 羟基丁酸酯(2); 在碱的存在下使化合物(2)环氧化,得到4-环己基 - (2S,3R) - 环氧丁酸酯(3); 在路易斯酸存在下使化合物(3)与低级三烷基甲硅烷基叠氮化物反应,得到(3S) - 叠氮-4-环己基 - (2S) - 取代的丁酸酯(4); 使化合物(4)进行氢解以制备(2S,3S) - 环己基稳定剂衍生物(5); 并使化合物(5)的2位的构型反转。

    Process for preparing optically active cyclic compounds
    7.
    发明授权
    Process for preparing optically active cyclic compounds 失效
    光学活性环状化合物的制备方法

    公开(公告)号:US5780649A

    公开(公告)日:1998-07-14

    申请号:US706282

    申请日:1996-09-04

    CPC分类号: C07D307/33 C07D307/20

    摘要: A process for preparing optically active 3-hydroxy-.gamma.-butyrolactone or optically active 3-hydroxytetrahydrofuran through a short route and by using an easily available and inexpensive starting material and an inexpensive reagent easy to handle is disclosed. The process comprises cyclizing an optically active compound represented by formula (II): ##STR1## wherein Q represents an alkoxycarbonyl group having 1 to 4 carbon atoms or a hydroxymethyl group; X represents a halogen atom; and the asterisk * means an asymmetric carbon atom, under an acidic condition.

    摘要翻译: 公开了一种通过短路线制备光学活性3-羟基-γ-丁内酯或光学活性3-羟基四氢呋喃的方法,并且通过使用易于获得且廉价的原料和易于处理的便宜的试剂。 该方法包括使由式(II)表示的光学活性化合物环化:其中Q表示具有1至4个碳原子的烷氧基羰基或羟甲基; X表示卤原子; 且在酸性条件下,星号*表示不对称碳原子。