The present invention provides a process of starting from N-alkoxycarbonyl-ethylamine compounds having a leaving group at the &bgr;-position to prepare oxazolidinone derivatives of &bgr;-hydroxyethylamine compounds having an inverted steric configuration at the &bgr;-position carbon, which comprises introducing a step of treating in contact with water with heating under acidic to neutral conditions into the process. Also, the present invention provides a process of starting from N-alkoxycarbonyl-ethylamine compounds having a leaving group at the &bgr;-position to prepare &bgr;-hydroxyethylamine compounds having an inverted steric configuration at the &bgr;-position carbon, which comprises subjecting the oxazolidinone derivatives prepared as described above to a step of treating in contact with water under basic conditions.
本发明提供了一种从&bgr;-位具有离去基团的N-烷氧羰基-
乙胺化合物开始制备&bgr;-位碳具有倒立体构型的&bgr;-羟乙基胺化合物的
噁唑烷酮衍
生物的工艺,该工艺包括在酸性至中性条件下引入与
水接触并加热处理的步骤。此外,本发明还提供了一种从在&bgr;-位上具有离去基团的N-烷氧基羰基-
乙胺化合物开始制备在&bgr;-位碳上具有倒立体构型的&bgr;-羟乙基胺化合物的工艺,该工艺包括将如上所述制备的
噁唑烷酮衍
生物在碱性条件下与
水接触处理的步骤。