Process for producing optically active chroman derivative and intermediate
申请人:Mitsuda Masaru
公开号:US20050014818A1
公开(公告)日:2005-01-20
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):
PROCESS FOR PRODUCING OPTICALLY ACTIVE CHROMAN DERIVATIVE AND INTERMEDIATE
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):