公开(公告)号：US06812363B2

公开(公告)日：2004-11-02

申请号：US10271299

申请日：2002-10-15

申请人： Krishna K. Maheshwari ,  Rayaprolu Kodandarama Sarma ,  Shreerang Vidyadhar Joshi ,  Anup Ramkrishna Barde ,  Rajiv Pandurang Sutar ,  Prasad Vasudeo Ranade

发明人： Krishna K. Maheshwari ,  Rayaprolu Kodandarama Sarma ,  Shreerang Vidyadhar Joshi ,  Anup Ramkrishna Barde ,  Rajiv Pandurang Sutar ,  Prasad Vasudeo Ranade

IPC分类号： C07C22900

CPC分类号： C07C227/36 ,  C07B2200/07 ,  C07C229/36

摘要： A process for preparing racemic mixtures containing nearly equal amounts of stereo isomers of compounds of formula (I), or their salts, by heating an enantiomerically enriched material with thionyl chloride. A required useful enantiomer may thereby be recovered from unwanted mother liquors that would otherwise be otherwise be discarded.

摘要翻译： 通过用亚硫酰氯加热对映异构体富集的物质，制备含有等量的式（I）化合物的立体异构体或其盐的外消旋混合物的方法。因此可以从不需要的母液中回收所需的有用的对映异构体 否则被丢弃。