METHOD FOR PRODUCING ESZOPICLONE DIBENZOYL-D-TARTRATE, METHOD FOR PRODUCING ESZOPICLONE, AND CRYSTAL OF ESZOPICLONE DIBENZOYL-D-TARTRATE

摘要

To provide a novel technique of producing eszopiclone dibenzoyl-D-tartrate, and provide eszopiclone dibenzoyl-D-tartrate that is stable to heat.SOLUTION: A solvent mainly composed of a ketone having carbon atoms of 3 or more and 10 or less is used to dissolve eszopiclone dibenzoyl-D-tartrate, and from the solvent after dissolution, crystal is precipitated.SELECTED DRAWING: Figure 1