Optical resolution of threo-2-hydroxy-3-(2-aminophenylthio)-3-(4-methoxyphenyl)-propionic acid
申请人:TEVA PHARMACEUTICAL INDUSTRIES, LTD.
公开号:EP0581169A1
公开(公告)日:1994-02-02
D(+)-threo-2-hydroxy-3-(2-aminophenylthio)-3-(4-methoxyphenyl)propionic acid, an important intermediate in the synthesis of diltiazem hydrochloride, is obtained in better yields and high optical purity by a novel resolution process comprising the reaction of 2 moles of the (±) racemic acid with 1 mole of quinine and 1 mole of a base in a suitable polar solvent system to form a salt of the D(+) acid and quinine which precipitates; separating said salt and decomposing it with a strong base.
D(+)-threo-2-hydroxy-3-(2-aminophenylthio)-3-(4-methoxyphenyl)propionic acid 是合成盐酸地尔硫卓的一种重要中间体,通过一种新的解析工艺可以获得较高的产率和光学纯度,该工艺包括:在合适的极性溶剂体系中,将 2 摩尔的(±)外消旋酸与 1 摩尔的奎宁和 1 摩尔的碱反应,形成 D(+) 酸和奎宁的盐,并沉淀下来;分离所述盐并用强碱分解。