The present invention provides a process for the preparation of the dextrorotatory isomer of zopiclone (eszopiclone). The present invention also provides eszopiclone di-p-anisolyl-L-tartrate and eszopiclone diacetyl-L-tartrate, which are useful as intermediates in a process for preparing eszopiclone.
本发明提供了一种制备左旋左西泮(左西泮)的过程。本发明还提供了对映异物左西泮二对甲氧基-
L-酒石酸盐和左西泮
二乙酰-
L-酒石酸盐,这些盐在制备左西泮的过程中作为中间体是有用的。