Alcohol-ester separation by recrystallization
    8.
    发明授权
    Alcohol-ester separation by recrystallization 失效
    通过重结晶进行醇酯分离

    公开(公告)号:US5445963A

    公开(公告)日:1995-08-29

    申请号:US660830

    申请日:1991-02-26

    申请人: Neil W. Boaz

    发明人: Neil W. Boaz

    摘要: A process is disclosed for the separation of an enantiomerically enriched 1-tosyloxy-2-acyloxy-3-butene and an enantiomerically enriched 1-tosyloxy-2-hydroxy-3-butene from a first mixture containing both compounds. The process includes the steps of:(a) forming a solution of the mixture in an organic solvent;(b) bringing the solution formed in (a) to a temperature wherein most of the enantiomerically enriched 1-tosyloxy-2-hydroxy-3-butene precipates, leaving in solution most of the enantiomerically enriched 1-tosyloxy-2-acyloxy-3-butene; and(c) separating the precipitate formed in (b) from the solution.

    摘要翻译: 公开了从含有两种化合物的第一混合物分离对映体富集的1-甲氧基-2-酰氧基-3-丁烯和对映体富集的1-甲苯氧基-2-羟基-3-丁烯的方法。 该方法包括以下步骤:(a)在有机溶剂中形成混合物的溶液; (b)使(a)中形成的溶液达到大部分对映体富集的1-甲苯氧基-2-羟基-3-丁烯沉淀的温度,在溶液中留下大部分对映体富集的1-甲氧基-2-酰氧基-3 丁烯 和(c)将(b)中形成的沉淀物与溶液分离。

    Method of intercoversion of enantiomers of acyclic
1,2-dihydroxy-3-alkenes
    9.
    发明授权
    Method of intercoversion of enantiomers of acyclic 1,2-dihydroxy-3-alkenes 失效
    无环1,2-二羟基-3-烯烃对映异构体互变的方法

    公开(公告)号:US5250743A

    公开(公告)日:1993-10-05

    申请号:US999240

    申请日:1992-12-31

    申请人: Neil W. Boaz

    发明人: Neil W. Boaz

    摘要: In accordance with the present invention, a method for the interconvertion of the enantiomers of acyclic 1,2-dihydroxy-3-alkenes or for converting either enantiomer of acylic 1,2-dihydroxy-3-alkenes to the corresponding antipodal 1-hydroxy-2-alkoxy-3-alkene compounds has been discovered, comprising reacting in an acidic reaction media either enantiomer of an acylic vinyl epoxide (which can be derived from the corresponding acyclic 1,2-dihydroxy-3-alkene) with water, alcohol, or a mixture thereof. When substantially optically pure acyclic vinyl epoxide compounds are employed in the inventive method, the interconverted acyclic 1,2-dihydroxy-3-alkene or 1-hydroxy-2-alkoxy-3-alkene compound products are also substantially optically pure.

    摘要翻译: 根据本发明,可以将非环形1,2-二羟基-3-烯烃的对映体相互转化或将酰基1,2-二羟基-3-烯烃的对映异构体转化成相应的对映体1-羟基-3-烯烃的方法, 已经发现了2-烷氧基-3-烯烃化合物,包括在酸性反应介质中使酰基乙烯基环氧化物的对映异构体(其可衍生自相应的无环1,2-二羟基-3-烯烃)与水,醇, 或其混合物。 当本发明方法中使用基本上光学纯的无环乙烯基环氧化合物时,相互转化的无环1,2-二羟基-3-烯烃或1-羟基-2-烷氧基-3-烯烃化合物产物也基本上是光学纯的。