The invention relates to a method for the production of (R)- or (S)-8-chloro-6-hydroxyoctanoic acid alkyl esters of the general formula (R)-II or (S)-II
in which R has the meaning C
1-4
-alkyl, from 8-chloro-6-oxooctanoic acid alkyl esters of the general formula I
in which R has the above meaning, by enzymatic reduction using alcohol dehydrogenases, such as
Lactobacillus brevis
or
Thermoanaerobium brokii
, in the presence of cofactor regeneration systems.
The resulting (R)- and (S)-8-chloro-6-hydroxyoctanoic acid esters can be converted in a known manner into (R)-α-lipoic acid and (S)-α-lipoic acid, respectively.
本发明涉及一种生产通式为(R)-II或(S)-II的(R)-或(S)-8-
氯-
6-羟基辛酸烷基酯的方法。
其中 R 的含义为 C
1-4
-烷基,由通式 I 的 8-
氯-6-氧代
辛酸烷基酯组成
其中 R 具有上述含义,通过使用醇脱氢酶进行酶还原,如
乳酸杆菌
或
酵母菌
在辅因子再生系统存在的情况下进行酶还原。
得到的(R)-和(S)-8-
氯-
6-羟基辛酸酯可按已知方式分别转化为(R)-
α-硫辛酸和(S)-
α-硫辛酸。