| 摘要 |
We have surprisingly and unexpectedly found that linezolid crystalline Form III can be prepared in an improved, efficient and cost effective process, in high purity and with high yield, by reacting the solution of (S)-N-[[3-[3-fluoro-4-[4-morpholinyl] phenyl]-2-oxo-5-oxazolidinyl]methyl]amine in methylene chloride with acetic anhydride, optionally in the presence of an organic base, to produce a reaction mass containing linezolid, followed by layer separation and subsequent carbon treatment to the resulting organic layer to form a filtrate, adding water to the resulting filtrate, and subsequent removal of methylene chloride solvent by distillation, optionally seeding the reaction mass during the distillation process, to produce the crystalline Form III of linezolid. |
