Provided is a process for efficiently producing N-glycyltyrosine of high purity represented by the following formula:
a salt thereof, or a solvate thereof, which comprises adding dropwise to an aqueous suspension of tyrosine or a salt thereof 2 equivalents or more of a haloacetyl halide and an aqueous solution of an inorganic base simultaneously in the presence or absence of an organic solvent, and subjecting the resulting N-haloacetyltyrosine to a reaction with an ammonium ion. Also provided are N-glycyl-L-tyrosine dihydrate having the crystal structures showing specific diffraction patterns in X-ray powder diffraction and processes for producing the same which are characterized by comprising crystallizing the dihydrate from an ethanol-water mixed solvent or water.
本发明提供了一种高效生产下式所代表的高纯度 N-甘
氨酰
酪氨酸的工艺:
的盐或其溶液的工艺,该工艺包括在有机溶剂存在或不存在的情况下,同时向
酪氨酸或其盐的
水悬浮液中滴加 2 个当量或更多的卤乙
酰卤和
无机碱水溶液,并使生成的 N-卤乙酰
酪氨酸与
铵离子反应。此外,还提供了具有在 X 射线粉末衍射中显示特定衍射图样的晶体结构的
N-甘氨酰-L-酪氨酸二水合物,以及生产
二水合物的工艺,其特征在于包括从
乙醇-
水混合溶剂或
水中结晶
二水合物。