The invention relates to a substantially pure linezolid hydroxide having R-isomer content more than about 99.9% relative to its S-isomer. Further aspect of invention provides the ambient moisture condition, which is critical for enantiomeric pure linezolid hydroxide. The obtained substantially enantiomerically pure linezolid hydroxide compound of formula-II can be subsequently converted into the linezolid compound of formula-I, having S-isomer content more than 99.9% relative to R-isomer. Further the invention provides an improved process for preparation of enantiomeric pure linezolid Form-I, wherein linezolid Form-I having the purity more than 99.9% relative to any other known polymorphic form of linezolid. The obtained enantiomeric pure linezolid Form-I can be subsequently converted into the other known polymorphic forms linezolid. The invention also provides stable and substantially solvent-free crystal of Form-I of linezolid.
该发明涉及一种具有相对于其S-异构体而言R-异构体含量超过约99.9%的基本纯的
利奈唑酮羟基。该发明的另一个方面提供了环境湿度条件,这对于手性纯的
利奈唑酮羟基至关重要。根据公式-II获得的基本手性纯的
利奈唑酮羟基化合物随后可以转化为具有相对于R-异构体而言超过99.9%的S-异构体含量的
利奈唑酮化合物。此外,该发明提供了一种改进的手性纯
利奈唑酮I型的制备工艺,其中
利奈唑酮I型的纯度相对于
利奈唑酮的任何其他已知多形态形式均超过99.9%。获得的手性纯
利奈唑酮I型随后可以转化为
利奈唑酮的其他已知多形态形式。该发明还提供了
利奈唑酮I型的稳定且基本无溶剂的晶体。