申请人:KANEKA CORPORATION
公开号:EP1445324A1
公开(公告)日:2004-08-11
A process for easily producing various optically active chroman derivatives that are useful as pharmaceutical intermediates from inexpensive starting materials is provided.
Cyclic hemiacetal (1) obtained from dihydrocoumarin through one step is asymmetrically reduced to produce an optically active halohydrin derivative (3), and the optically active halohydrin derivative (3) is cyclized to produce an optically active chroman derivative (13):
本发明提供了一种利用廉价起始原料轻松生产各种光学活性色满衍生物的工艺,这些衍生物可用作药物中间体。
通过一个步骤从二氢香豆素得到的环状半缩醛(1)经不对称还原生成光学活性卤代醇衍生物(3),光学活性卤代醇衍生物(3)经环化生成光学活性色满衍生物(13):