Process for the resolution of enantiomers of benzopyran derivatives
    9.
    发明授权
    Process for the resolution of enantiomers of benzopyran derivatives 失效
    苯并噻吩衍生物成分的分解方法

    公开(公告)号:US5103025A

    公开(公告)日:1992-04-07

    申请号:US608442

    申请日:1990-11-02

    IPC分类号: C07B57/00 C07D493/04

    CPC分类号: C07D493/04

    摘要: The invention relates to a process for the resolution of enantiomers of 3,4-epoxy-3,4-dihydro-2,2-dimethyl-3-R-2H-1-benzopyran-6-carbonitriles (I), in which R is H or CH.sub.3, characterized in that racemic I is dissolved in an inert solvent or solvent mixture together with a small amount of (-)-I [or (+)-I], the solution is seeded with (-)-I [or (+)-I], the precipitated (-)-I [or (+)-I] is isolated, further racemic I is dissolved in the filtrate, seeded with (+)-I [or (-)-I], the precipitated (+)-I [or (-)-I] is isolated and, if desired, this crystallization cycle is repeated one or more times.

    摘要翻译: 本发明涉及一种拆分3,4-环氧-3,4-二氢-2,2-二甲基-3-R-2H-1-苯并吡喃-6-腈(I)的对映异构体的方法,其中R 是(H)或CH3,其特征在于将外消旋I与少量( - ) - I [或(+) - I]一起溶解在惰性溶剂或溶剂混合物中,将溶液与( - ) - 或(+) - I],分离出沉淀的( - ) - I [或(+) - I],将进一步的外消旋I溶于滤液中,用(+) - [或( - ) - ,沉淀的(+) - I [或( - ) - I]被分离,如果需要,该结晶循环重复一次或多次。