申请人:Dainippon Pharmaceutical Co., Ltd.
公开号:EP0105696A1
公开(公告)日:1984-04-18
Optically active N-substituted phenylalaninols of the formula (I):
wherein R is isopropyl, 1-ethylpropyl, cyclopentyl, cyclohexyl, cycloheptyl, 4-methylbenzyl, 4-methoxybenzyl, or 3,4-methylenedioxybenryl; and acid addition salts thereof which are useful as a resolving agent, and a process for preparing D-3-acetylthio-2-methylpropionic acid which comprises reacting DL-3-acetylthio-2-methylpropionic acid with an optically active N-substituted phenylalaninol of the formula (I) to form diastereomeric salts, subjecting the formed diastereomeric salts to a fractional crystallization from a solvent to separate the D-acid salt from the L-acid salt, and then decomposing the D-acid salt with a mineral acid to give D-3-acetylthio-2-methylpropionic acid.
式(I)的光学活性 N-取代的苯丙氨醇:
其中 R 为异丙基、1-乙基丙基、环戊基、环己基、环庚基、4-甲基苄基、4-甲氧基苄基或 3,4-亚甲二氧基苄基;及其可用作溶解剂的酸加成盐,以及制备 D-3-乙酰巯基-2-甲基丙酸的工艺,该工艺包括使 DL-3-乙酰巯基-2-甲基丙酸与光学活性 N-取代的式 (I) 苯丙氨醇反应,形成非对映异构盐、将形成的非对映异构盐从溶剂中进行分馏结晶,以分离 D 酸盐和 L 酸盐,然后用矿物酸分解 D 酸盐,得到 D-3-乙酰硫基-2-甲基丙酸。