申请人:TANABE SEIYAKU CO., LTD.
公开号:EP0861834A1
公开(公告)日:1998-09-02
A process for preparing an optically active trans-3-substituted glycidic acid ester compound of the formula (I):
wherein ring A is a substituted or unsubstituted benzene ring, and R1 is an ester residue, which comprises:
preparing a solution of one optical isomer (A) and the other optical isomer (B) of the ester compound (I), both of which are the optical isomers due to the asymmetric carbons at 2- and 3-positions, and an ester compound (B') which is different from the isomer (B) only in the ester residue R1,
crystallizing the optical isomer (A) from the solution up to the extent that the optical isomer (A) is crystallized without the precipitation of the optical isomer (B) due to the presence of the ester compound (B') though the optical isomer (B) would precipitate if the ester compound (B') were not present, and
isolating the crystals of the optical isomer (A), whereby a desired optical isomer (A) can be obtained in high purity and in a high yield such that the desired isomer can be crystallized until the concentration of the desired isomer in the mother liquor becomes very low as compared with conventional processes.
一种制备具有光学活性的反式-3-取代缩水甘油酸酯类化合物的工艺,其式为 (I):
其中环 A 是取代或未取代的苯环,R1 是酯残基,它包括
制备酯化合物(I)的一种光学异构体(A)和另一种光学异构体(B)的溶液,这两种光学异构体都是由于 2 位和 3 位上的碳不对称而形成的光学异构体,以及一种酯化合物(B'),该酯化合物(B')仅在酯残基 R1 上与异构体(B)不同、
从溶液中结晶出光学异构体(A),结晶程度以光学异构体(A)不因酯类化合物(B')的存在而析出光学异构体(B)为限,尽管如果没有酯类化合物(B'),光学异构体(B)也会析出,以及
分离出光学异构体(A)的晶体,从而获得高纯度和高产率的所需光学异构体(A),使所需异构体可以结晶,直到母液中的所需异构体浓度与传统工艺相比变得非常低。