Process for the preparation of vincaminic acid esters
    29.
    发明授权
    Process for the preparation of vincaminic acid esters 失效
    用于制备长春酸酯的方法

    公开(公告)号:US4464534A

    公开(公告)日:1984-08-07

    申请号:US425866

    申请日:1982-09-28

    IPC分类号: C07D461/00 C07D455/00

    CPC分类号: C07D461/00

    摘要: The invention relates to a new process for the preparation of apovincaminic acid esters. More particularly, the invention concerns a process for preparing racemic and optionally active vincaminic acid esters of the formula (I) ##STR1## in which R.sup.1 and R.sup.2 independently stand for alkyl having from one to 6 carbon atoms, and 14-epimers thereof.According to the invention an octahydroindolo[2,3-a]quinolizine-oxime ester of the formula (II) ##STR2## in which R.sup.1 and R.sup.2 have the same meaning as defined above, is reacted with an aqueous solution of sulfurous acid or a salt thereof at a temperature of 80.degree. to 110.degree. C. and the 14-epimeric mixture obtained is epimerized or separated in a known manner and if desired, the racemic vincaminic acid esters are resolved.The valuable, pharmaceutically active compounds of the formula (I) can be prepared according to the invention in a considerably improved yield and the undesired side reactions can be suppressed and/or the by-products can easily be converted into other pharmaceutically active materials.

    摘要翻译: 本发明涉及一种用于制备氨磷酸酯的新方法。 更具体地说,本发明涉及一种制备式(I)的外消旋和任选活性的长春胺酸酯的方法,其中R 1和R 2独立代表具有1至6个碳原子的烷基,和14-差向异构体 其中。 根据本发明,其中R 1和R 2具有与上述相同的含义的式(II)的二氢吲哚并[2,3-a]喹嗪肟酯与其中的亚硫酸酯水溶液 酸或其盐,并且所得的14-差向异构体混合物以已知方式进行差向异构化或分离,如果需要,外消旋的长春碱酯被分解。 式(I)的有价值的药物活性化合物可以按照本发明以显着提高的产量制备,并且可以抑制不期望的副反应和/或副产物可以容易地转化成其它药物活性物质。