Method of producing enantiomerically pure R-(+)-alpha-lipoic acid and S-(-)
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.
Verfahren zur Herstellung enantiomerenreiner R-(+)-alpha-Liponsäure und S-(-)-alpha-Liponsäure (Thioctsäure) sowie Nonen- beziehungsweise Mesylderivate als Zwischenprodukte hierfür