申请人:Hoechst Aktiengesellschaft
公开号:US04925958A1
公开(公告)日:1990-05-15
The invention relates to a process for the preparation of compounds of the formula I ##STR1## in which R.sup.1 denotes (substituted) aryl or (substituted) cyclohexyl and R.sup.2 =alkyl, in which a compound of the formula R.sup.1 --NH.sub.2 is reacted with at least twice the molar amount of glyoxylic acid in the presence of water and the resulting acid is then esterified.
本发明涉及一种制备式I的化合物的方法,其中R.sup.1表示(取代)芳基或(取代)环己基,R.sup.2=烷基,在该方法中,式R.sup.1 --NH.sub.2的化合物在水的存在下与至少两倍摩尔量的乙酰乙酸反应,然后酸化产物被酯化。