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    • 60. 发明授权
    • Process for the reduction of amino acids and the derivatives thereof
    • 用于还原氨基酸及其衍生物的方法
    • US5744611A
    • 1998-04-28
    • US793702
    • 1997-03-03
    • Matthias KottenhahnKarlheinz DrauzHans Hilpert
    • Matthias KottenhahnKarlheinz DrauzHans Hilpert
    • C07D263/24C07C213/00C07C215/02C07C215/08C07C215/10C07C215/28C07D263/20
    • C07D263/20C07C213/00C07C215/08C07C215/10C07C215/28
    • A process is disclosed for reducing amino acids and derivatives thereof Compounds of formula (I), in which n=0 or 1 and R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 have the meanings given in the description, are reduced to the corresponding amino alcohols of formula (II): the formula (I) compounds are converted in a first step, in at least one alcohol and with the addition of acid and heat to an ester, this process producing a reaction mixture containing the ester; the ester is converted in a second reaction step with alkali or alkaline earth borohydride to compounds of formula II. By specifying that the second step be carried out without isolating the ester from the reaction mixture and by using alkali or alkaline earth borohydrides which are not activated, the invention facilitates the production from amino acids and their derivatives of the correponding alcohols in a simple "single vessel" process, with high yields and in such a way as to preserve a given centre of chirality. Applications: synthesis components, preparation of optically active compounds splitting of racemic compounds. ##STR1##
    • PCT No.PCT / EP95 / 03281 Sec。 371日期1997年3月3日 102(e)1997年3月3日PCT PCT 1996年8月17日PCT公布。 出版物WO96 / 07634 日本公开了1996年3月14日公开的用于还原氨基酸及其衍生物的方法式(I)化合物,其中n = 0或1,R1,R2,R3,R4,R5和R6具有说明书中给出的含义, 被还原成相应的式(II)的氨基醇:式(I)化合物在第一步中,在至少一种醇中转化,并加酸和加热至酯,该方法产生含有 酯; 该酯在与碱金属或碱土金属硼氢化物的第二反应步骤中转化为式II化合物。 通过规定第二步在不从反应混合物中分离出酯的情况下进行,并且通过使用未活化的碱金属或碱土金属硼氢化物,本发明便于以简单的“单一”形式从相应的醇的氨基酸及其衍生物生产 船只“过程,产量高,并且以保持给定的手性中心的方式。 应用:合成成分,外消旋化合物的旋光活性化合物的制备。 (I)(II)