Process for Preparing Levosimendan and Intermediates for Use in the Process
    87.
    发明申请
    Process for Preparing Levosimendan and Intermediates for Use in the Process 有权
    制备用于过程中的左西孟旦和中间体的方法

    公开(公告)号:US20120165524A1

    公开(公告)日:2012-06-28

    申请号:US13384211

    申请日:2010-07-12

    CPC classification number: C07D237/04

    Abstract: In an embodiment, the present invention provides a process for preparing (−)-6-(4-aminophenyl)-5-methylpyridazin-3-(2H)-one, which process comprises: a) reacting racemic 6-(4-aminophenyl)-4,5-dihydro-5-methyl-3-(2H)-pyridazinone of formula II with a chiral tartaric acid derivative to obtain a diastereomeric salt of (−)-6-(4-aminophenyl)-4,5-dihydro-5-methyl-3-(2H)-pyridazinone and the chiral tartaric acid derivative; and b) reacting the diastereomeric salt with a base to obtain (−)-6-(4-aminophenyl)-4,5-dihydro-5-methyl-3-(2H)-pyridazinone. The (−)-6-(4-aminophenyl)-4,5-dihydro-5-methyl-3-(2H)-pyridazinone may be used to prepare levosimendan.

    Abstract translation: 在一个实施方案中,本发明提供了制备( - ) - 6-(4-氨基苯基)-5-甲基哒嗪-3-(2H) - 酮的方法,该方法包括:a)使外消旋的6-(4-氨基苯基) )-4,5-二氢-5-甲基-3-(2H) - 哒嗪酮与手性酒石酸衍生物反应,得到( - ) - 6-(4-氨基苯基) 二氢-5-甲基-3-(2H) - 哒嗪酮和手性酒石酸衍生物; 和b)使非对映体盐与碱反应,得到( - ) - 6-(4-氨基苯基)-4,5-二氢-5-甲基-3-(2H) - 哒嗪酮。 ( - ) - 6-(4-氨基苯基)-4,5-二氢-5-甲基-3-(2H) - 哒嗪酮可用于制备左西孟旦。

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