Dynamic resolution of isomers and resolved isomers
    2.
    发明授权
    Dynamic resolution of isomers and resolved isomers 有权
    动态拆分异构体和拆分的异构体

    公开(公告)号:US07388098B2

    公开(公告)日:2008-06-17

    申请号:US09961932

    申请日:2001-09-24

    摘要: Provided is a dynamic resolution method of enriching a desired isomer of an alpha-substituted carboxylic acid relative to an undesired isomer, the method comprising: (a) in a solvent, contacting the alpha-substituted carboxylic acid, wherein the alpha substitution is with a leaving group and wherein the alpha carbon is chiral, with a homochiral amine to form a salt that is partially insoluble under selected reaction conditions, wherein the homochiral amine is selected so that the solubility of the amine salt of the undesired alpha-substituted carboxylic acid is greater than that of the amine salt of the desired alpha-substituted carboxylic acid under the selected reaction conditions; (b) reacting under the selected reaction conditions the salt with a nucleophile, wherein the reacting is effective in producing a net increase in the less soluble amine salt of the alpha-substituted carboxylic acid, and wherein the selected conditions are selected to (i) promote nucleophilic substitution of the nucleophile and the leaving group or (ii) to produce the increase in the less soluble amine salt in the absence of a strong base; and (c) maintaining the reaction for a period of time effective to increase the amount of the desired alpha-substituted carboxylic acid isomer.

    摘要翻译: 提供了相对于不期望的异构体富集α-取代的羧酸的所需异构体的动态拆分方法,该方法包括:(a)在溶剂中使α-取代的羧酸接触,其中α取代为 离去基团,其中所述α碳是手性的,与同基因胺形成在所选择的反应条件下部分不溶的盐,其中选择所述同基因胺,使得不需要的α-取代羧酸的胺盐的溶解度为 在选择的反应条件下大于所需α-取代羧酸的胺盐的浓度; (b)在所选择的反应条件下使所述盐与亲核试剂反应,其中所述反应有效地产生所述α-取代羧酸的较不溶性胺盐的净增加,并且其中所选择的条件选择为:(i) 促进亲核试剂和离去基团的亲核取代,或(ii)在没有强碱的情况下产生较不溶性胺盐的增加; 和(c)保持反应一段时间有效以增加所需的α-取代的羧酸异构体的量。

    Process for hydroxyazapirones
    3.
    发明授权
    Process for hydroxyazapirones 失效
    羟基氮杂环己烷的方法

    公开(公告)号:US06897309B2

    公开(公告)日:2005-05-24

    申请号:US10636070

    申请日:2003-08-07

    CPC分类号: C07D401/12

    摘要: This invention describes a process for preparing hydroxyazapirones of Formula I from azapirones of Formula II. The process comprises treating azapirones with a strong base, monitoring enolate formation of the azapirone by IR spectroscopy, and reacting the enolate with a source of molecular oxygen in the presence of a reductant. The process is suitable for large scale production of hydroxyazapirones.

    摘要翻译: 本发明描述了由式II的氮杂环庚烷制备式I的羟基氮杂环庚烷的方法。 该方法包括用强碱处理唑吡酮,通过红外光谱监测阿扎地隆的烯醇化物形成,并在还原剂存在下使烯醇化物与分子氧源反应。 该方法适用于大规模生产羟基氮杂环庚烷。