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    • 8. 发明授权
    • Synthesis of r(+)α-lipoic acid
    • r(+)α-硫辛酸的合成
    • US06864374B2
    • 2005-03-08
    • US10398890
    • 2001-10-08
    • Flavio VillaniAntonio NardiAnnibale SalviGiovanna Falabella
    • Flavio VillaniAntonio NardiAnnibale SalviGiovanna Falabella
    • C07B53/00C07B57/00C07B61/00C07C51/41C07C51/487C07C53/19C07C67/08C07C69/63C07D339/04C07D339/02
    • C07D339/04
    • Process for the synthesis of R(+)α-lipoic acid comprising the following stages: a) Salifying of racemic 6,8-halo-octanoic acid with S(−)α-methylbenzylamine; b) separation by filtration of the crystallized diastereoisomeric salt of R(+)6,8-di-halo-octanoic acid-S(−)α-methylbenzylamine; c) purification by re-crystallization of the diastereoisomeric salt of R(+)6,8-di-halo-octanoic acid-S(−)α-methylbenzylamine; (d) separation of the diastereoisomeric salt to obtain R(+)6,8-di-halo-octanoic acid by reation of said salt with strong mineral acids in an aqueous solution with a dilution between 2 and 10% by weight; e) esterification of R(+)6,8-di-halo-octanoic acid to obtain the corresponding alkyl ester; f) reaction of the alkyl ester of R(+)6,8-di-halo-octanoic acid in an organic solvent with an aqueous solution of alkali disulfide in presence of a compound for phase transfer catalysis; g) hydolysis of the ester of R(+)α-lipoic acid.
    • 包括以下步骤的合成R(+)α-硫辛酸的方法:a)用S( - ) - α-甲基苄胺磺化外消旋6,8-辛酸; b)通过过滤R(+)6,8-二卤代辛酸-S( - )α-甲基苄胺的结晶非对映异构体盐分离; c)通过R(+)6,8-二 - 卤代 - 辛酸-S( - ) - α-甲基苄胺的非对映异构体盐的重结晶进行纯化; (d)通过用强无机酸在稀释在2至10重量%之间的水溶液中重复所述盐,分离非对映异构盐以获得R(+)6,8-二卤代辛酸; e)R(+)6,8-二卤代辛酸酯化得到相应的烷基酯; f)在相转移催化化合物存在下,R(+)6,8-二卤代辛酸烷基酯在有机溶剂中与碱性二硫化物水溶液的反应; g)R(+)α-硫辛酸的酯的水解。