AN IMPROVED PROCESS FOR THE PREPARATION OF (3R,4R)-(1-BENZYL-4-METHYLPIPERIDIN-3-YL)-METHYLAMINE
    1.
    发明申请
    AN IMPROVED PROCESS FOR THE PREPARATION OF (3R,4R)-(1-BENZYL-4-METHYLPIPERIDIN-3-YL)-METHYLAMINE 有权
    (3R,4R) - (1-苄基-4-甲基哌啶-3-基) - 甲基胺的制备改进方法

    公开(公告)号:US20160102057A1

    公开(公告)日:2016-04-14

    申请号:US14891028

    申请日:2014-12-02

    摘要: The present invention is related to an improved and efficient process for preparation of (3R,4R)-(1-benzyl-4-methylpiperidin-3-yl)-methylamine which comprises: (a) N-acylation of 3-Amino-4-methyl pyridine; (b) Quarternization of 3-Acetylamino-4-methyl pyridine using benzyl halide; (c) Partial reduction of quarternized 3-Acetylamino-4-methyl pyridine by Sodium borohydride in Methanol or water; (d) Hydrolysis of partially reduced product to 1-Benzyl-4-methylpiperidin-3-one in presence of acid; (e) Reductive amination of 1-Benzyl-4-methylpiperidin-3-one using Methanolic methylamine in presence of Titanium(IV) isopropoxide in Methanol; (f) Resolution of 1-Benzyl-4-methylpiperidin-3-yl)-methylamine using Ditoluoyl (L) tartaric acid to get (3R,4R)-(1-benzyl-4-methylpiperidin-3-yl)-methylamine. The invention is also related to novel intermediates: wherein R, R′ and X are as described in the specification.

    摘要翻译: 本发明涉及制备(3R,4R) - (1-苄基-4-甲基哌啶-3-基) - 甲胺的改进和有效的方法,其包括:(a)3-氨基-4- 甲基吡啶; (b)使用苄基卤化合物对3-乙酰基氨基-4-甲基吡啶进行精制; (c)通过硼氢化钠在甲醇或水中部分还原季铵化的3-乙酰基氨基-4-甲基吡啶; (d)部分还原产物在酸存在下水解成1-苄基-4-甲基哌啶-3-酮; (e)在甲醇中的异丙醇钛(IV)存在下,使用甲醇甲胺还原1-苄基-4-甲基哌啶-3-酮的胺化反应; (f)使用Dauruoyl(L)酒石酸分解1-苄基-4-甲基哌啶-3-基) - 甲胺,得到(3R,4R) - (1-苄基-4-甲基哌啶-3-基) - 甲胺。 本发明还涉及新的中间体:其中R,R'和X如说明书中所述。