Process for the preparation of amino acid derivatives of the general formula I
where R1-R4 are as defined herein,
from the corresponding malonic acid monoester amides of the general formula II
by Hofmann degradation using a hypohalite in an aqueously basic medium, which comprises carrying out the reaction in the presence of an alcohol or amine and using the hypohalite in amounts of from 1.0 to 1.5 equivalents and the base in amounts of from 0.8 to 4.0 equivalents per mole of starting material II.
本发明涉及一种制备一般式I中R1-R4如定义所示的
氨基酸衍
生物的过程,该过程从一般式II中对应的马隆酸单酯酰胺开始,通过在
水性碱性介质中使用次卤酸进行Hofmann降解反应,其中在反应中存在醇或胺,并且使用1.0至1.5当量的次卤酸和0.8至4.0当量的碱每摩尔起始物II。