A multistage method for producing R-(+)-.alpha.-lipoic acid and S-(-)-.alpha.-lipoic acid (thioctic acid) by reacting a compound of formula II ##STR1## by means of enantioselective epoxidation to the epoxy alcohol of formula III, ##STR2## reduction to 1,3-diol-dihydroxynone-8-ene of formula IV, ##STR3## reaction with a substituted sulfonic acid chloride to 1,3-disulfoxynone-8-ene of formula V, ##STR4## oxidation with ruthenium tetroxide to 6,8-disulfoxyoctanoic acid of formula VI ##STR5## and subsequent reaction with sodium sulfide/sulfur.
一种生产R-(+)-
α-硫辛酸和S-(-)-
α-硫辛酸(
硫辛酸)的多级方法,通过对式II的化合物进行对映选择性环氧化反应,得到式III的环氧醇,然后还原为式IV的1,3
-二醇-二羟基酮-8-烯,再与取代
磺酸氯反应得到式V的1,3-二磺酰氧基酮-8-烯,再用
钌四氧化物氧化为式VI的6,8-二磺氧基
辛酸,最后与
硫化
钠/
硫反应。