申请人:Degussa
公开号:US04772727A1
公开(公告)日:1988-09-20
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.
一种多级方法用于通过对式II的化合物进行对映选择性环氧化反应,制备R-(+)-α-硫辛酸和S-(-)-α-硫辛酸(硫辛酸)。随后将得到的环氧醇(式III)还原为1,3-二醇-8-烯二酮(式IV),然后与取代磺酸氯反应形成1,3-二磺氧-8-烯二酮(式V),再经过钌酸四氧化物氧化成为6,8-二磺氧辛酸(式VI),最后与硫化钠/硫反应。