Preparation of (S)-2-[[3-[N-[4-[(4-fluorophenoxy)phenyl]methyl]carbamoyl]-4-methoxyphenyl]methyl]butanoic acid (referred to as compound (I)) on an industrial scale lies in the finding of crystals homogeneous and excellent in the stability and the establishment of a preparative process thereof. Novel crystals of compound (I) homogeneous and excellent in the stability characterized by exhibiting the diffraction angles (2θ) at at least 17.7°, 19.0° and 24.1° in the X-ray powder diffraction are provided by recrystallizing from an alcoholic solvent and purifying by acid-base treatment.
(S)-2-[[3-[N-[4-[(4-
氟苯氧)苯基]甲基]
氨基甲酰]-4-
甲氧基苯基]甲基]
丁酸(简称化合物(I))的工业规模制备在于发现晶体的均匀性和稳定性,并建立其制备过程。通过从
醇类溶剂中重新结晶并通过酸碱处理纯化,提供了表现出X射线粉末衍射中至少17.7°、19.0°和24.1°的衍射角度(2θ)的化合物(I)的新晶体,这些晶体均匀且稳定。