申请人:Hoechst Aktiengesellschaft
公开号:US04977260A1
公开(公告)日:1990-12-11
Process for preparing mono-, bi- and tricyclic amino acids, intermediates of this process, and a process for preparing same. The invention relates to a process for preparing compounds of the formula I ##STR1## in which R stands for hydrogen, alkyl or aralkyl and R.sup.1 to R.sup.5 are identical or different radicals, (substituted) alkyl, cycloalkyl or (substituted) aryl or in which the pairs of radicals R.sup.1 and R.sup.2, R.sup.2 and R.sup.3, and R.sup.4 and R.sup.5 together with the carbon atom(s) supporting them form a mono- or bicyclic ring system and the other radicals are hydrogen, by treating a compound of the formula II ##STR2## in which R and R.sup.1 to R.sup.5 have the abovoementioned meaning and R.sup.6 and R.sup.7 denote alkyl or aralkyl or together with the nitrogen atom supporting them form a heterocycle which can additionally contain an oxygen atom, with a reducing agent.
制备单环、双环和三环氨基酸的过程,该过程的中间体,以及制备它们的过程。本发明涉及一种制备式I化合物的过程:##STR1## 其中R代表氢、烷基或芳基烷基,R.sup.1至R.sup.5是相同或不同的基团,(取代)烷基、环烷基或(取代)芳基,或者其中基团R.sup.1和R.sup.2、R.sup.2和R.sup.3、R.sup.4和R.sup.5与支持它们的碳原子一起形成单环或双环环系统,其他基团为氢,通过使用还原剂处理式II的化合物:##STR2## 其中R和R.sup.1至R.sup.5具有上述含义,R.sup.6和R.sup.7表示烷基或芳基烷基,或者与支持它们的氮原子一起形成可以额外包含一个氧原子的杂环。