"> Process for the preparation of
(2RS,3RS)-3-(2'-aminophenylthio)-2-hydroxy-3-(4
    74.
    发明授权
    Process for the preparation of (2RS,3RS)-3-(2'-aminophenylthio)-2-hydroxy-3-(4"-methoxyphenyl)-propioni c acid methyl ester 失效
    制备(2RS,3RS)-3-(2'-氨基苯硫基)-2-羟基-3-(4“ - 甲氧基苯基) - 丙酸甲酯的方法

    公开(公告)号:US5756809A

    公开(公告)日:1998-05-26

    申请号:US742074

    申请日:1996-11-01

    CPC分类号: C07C319/14 C07C319/18

    摘要: (2RS,3RS)-3-(2'-aminophenylthio)-2-hydroxy-3-(4"-methoxyphenyl)-propionic acid methyl ester, an important precursor for the preparation of the pharmaceutical active substance diltiazem, is obtained in a particularly high stereoselectivity and yield by addition of o-aminothiophenol onto 3-(4'-methoxyphenyl)-glycidic acid methyl ester if the reaction is carried out in the presence of alkali metal salts of weak acids in the presence of catalytic amounts of iron compounds.

    摘要翻译: (2RS,3RS)-3-(2'-氨基苯硫基)-2-羟基-3-(4“ - 甲氧基苯基) - 丙酸甲酯,是制备药物活性物质地尔硫卓的重要前体 如果反应在弱酸的碱金属盐存在下,在催化量的存在下,在3-(4'-甲氧基苯基) - 缩水甘油酸甲酯中加入邻氨基苯硫酚,则具有特别高的立体选择性和产率 铁化合物。

    Process for the preparation of 2-chloroacrylonitrile
    75.
    发明授权
    Process for the preparation of 2-chloroacrylonitrile 失效
    制备2-氯丙烯腈的方法

    公开(公告)号:US5679826A

    公开(公告)日:1997-10-21

    申请号:US735717

    申请日:1996-10-23

    CPC分类号: C07C253/30

    摘要: 2-Chloroacrylonitrile is prepared in a particularly advantageous and readily industrially practicable manner by chlorinating acrylonitrile and then thermally cleaving the 2,3-diehloropropionitrile formed, by chlorinating acrylonitrile in the presence of a catalyst system comprising dimethylformamide and pyridine and/or pyridine derivatives and subjecting the resulting crude 2,3-dichloropropionitrile to thermal cleavage in the presence of the same catalyst system without the addition of further catalysts.

    摘要翻译: 通过氯化丙烯腈,然后在包含二甲基甲酰胺和吡啶和/或吡啶衍生物的催化剂体系存在下,通过氯化丙烯腈热分解形成的2,3-二氯丙腈,制备2-氯丙烯腈, 所得粗制的2,3-二氯丙腈在相同的催化剂体系的存在下进行热裂解而不加入另外的催化剂。