申请人:Boehringer Ingelheim GmbH
公开号:US04363766A1
公开(公告)日:1982-12-14
A process for the preparation of sulfur-containing N-benzyl-amino acids of the formula ##STR1## wherein X and Y, which may be identical to or different from each other, are each hydrogen or halogen; R.sub.1 is hydrogen or alkyl of 1 to 4 carbon atoms; R.sub.2 is hydrogen, alkyl of 1 to 3 carbon atoms, carboxy-lower alkyl or acyl; R.sub.3 is hydrogen or acyl; and n is 1 or 2; which comprises the steps of converting anthranilic acid or a halogenated anthranilic acid into the corresponding aldehyde, reacting the aldehyde with a compound of the formula ##STR2## wherein R.sub.1, R.sub.2 and n have the meanings previously defined, to form the corresponding Schiff's base, reducing the said Schiff's base, and recovering the reaction product.
一种制备含硫的N-苄基氨基酸的方法,其化学式为##STR1##其中X和Y可以相同也可以不同,分别为氢或卤素;R.sub.1为氢或1至4个碳原子的烷基;R.sub.2为氢、1至3个碳原子的烷基、羧基-低烷基或酰基;R.sub.3为氢或酰基;n为1或2;包括以下步骤:将间氨基苯甲酸或卤代间氨基苯甲酸转化为相应的醛,将所述醛与化学式为##STR2##其中R.sub.1、R.sub.2和n的含义如前所定义的化合物反应,形成相应的席夫碱,还原所述席夫碱,并回收反应产物。