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):
提供一种从廉价起始材料中轻松制备各种光学活性的色基衍
生物作为药物中间体的方法。通过一步反应从二氢
香豆素得到的环糖
半缩醛(1)经不对称还原制备出光学活性卤代醇衍
生物(3),然后将光学活性卤代醇衍
生物(3)环化得到光学活性色基衍
生物(13)。