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    • 1. 发明授权
    • Process for the production of a racemic thioctic acid
    • 制备外消旋硫辛酸的方法
    • US06844450B2
    • 2005-01-18
    • US10398891
    • 2001-10-08
    • Annibale SalviStefano MaioranaFrancesco Corcella
    • Annibale SalviStefano MaioranaFrancesco Corcella
    • C07D339/04C07D341/00
    • C07D339/04
    • Process for the synthesis of racemic thioctic acid comprising the following stages: a) reaction of the alkyl ester of 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 selected from the group consisting of quaternary ammonium or phosphonium salts having the following general formula: where: A is nitrogen of phosphorus, X is selected from the group consisting of Cl, Br, I, HSO4, and H2PO4 and the substitutents R1, R2, R3 and R4 are selection from the group consisting of linear or branched alkyl radicals having one to twenty carbon atoms (C1-C20), said substituents being identical or different one from the other, or only one of said substituents is selected from the group consisting of arylalkyl radicals having the following formula —(CH2)nC6H5 in which n=1-16; b) followed by the hydrolysis of the ester of racemic thiotic acid.
    • 包括以下步骤合成外消旋硫辛酸的方法:a)在相转移化合物存在下,6,8-二卤代辛酸的烷基酯在有机溶剂中与碱性二硫化物水溶液的反应 选自具有以下通式的季铵或鏻盐的催化剂:其中:A是磷的氮,X选自Cl,Br,I,HSO 4和H 2 PO 4,取代基R1,R2 ,R3和R4选自具有1-20个碳原子的直链或支链烷基(C1-C20),所述取代基彼此相同或不同,或者只有一个所述取代基选自基团 由具有下式的芳基烷基 - (CH 2)n C 6 H 5,其中n = 1-16; b)然后水解外消旋硫酸的酯。