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    • 14. 发明申请
    • PROCESS FOR THE PREPARATION OF 4-METHYLENEPIPERIDINES
    • 制备4-甲基哌啶的方法
    • WO1997011939A1
    • 1997-04-03
    • PCT/JP1996002810
    • 1996-09-26
    • KAKEN PHARMACEUTICAL CO., LTD.NAITO, Takanobu
    • KAKEN PHARMACEUTICAL CO., LTD.
    • C07D211/16
    • C07D211/62C07D211/22C07D211/70
    • A process for the preparation of 4-methylenepiperidines of general formula (VII) which comprises reacting an isonipecotate of general formula (I) (wherein R is methyl or ethyl) with an acylating agent of general formula (II): R X or the general formula (II'): (R )2O (wherein R is benzoyl or acetyl; and X is chlorine or bromine) in the presence or absence of a base to form an ester of general formula (III) (wherein R and R are each as defined above), reducing the ester with sodium borohydride or lithium borohydride in an organic solvent containing methanol, reacting the alcohol thus obtained with a halogenating agent without any solvent or in an organic solvent in the presence or absence of a base to obtain a halide, reacting this halide with a dehydrohalogenating agent in an organic solvent to obtain a methylene compound of general formula (VI) (wherein R is as defined above), and hydrolyzing the methylene compound with a strong alkali in water or an organic solvent containing water.
    • 制备通式(Ⅶ)的4-亚甲基哌啶的方法,该方法包括使通式(I)的异哌啶酸酯(其中R 1为甲基或乙基)与通式(II)的酰化剂反应: (R 2)2 O(其中R 2是苯甲酰基或乙酰基,X是氯或溴)在存在或不存在碱的情况下形成 将通式(III)(其中R 1和R 2各自如上所定义),在含有甲醇的有机溶剂中用硼氢化钠或硼氢化锂还原酯,将所得醇与卤化剂反应, 在有机溶剂存在或不存在下,在有机溶剂中,在有机溶剂存在或不存在下,得到卤化物,使该卤化物与脱卤化氢剂在有机溶剂中反应,得到通式(VI)的亚甲基化合物(其中R 2如上所定义) 并用强碱在水或有机溶剂中水解亚甲基化合物 含水。