C - Chemistry – Metallurgy – 07 – K
Patent
C - Chemistry, Metallurgy
07
K
C07K 5/062 (2006.01) C07C 231/12 (2006.01) C07C 233/47 (2006.01) C07K 1/02 (2006.01) C07K 5/06 (2006.01)
Patent
CA 2268586
Provided is a process for efficiently producing N-glycyltyrosine of high purity represented by the following formula: Image 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.
Imai Eiichiro
Imai Takahiro
Kasai Masaji
Mimura Takashi
Ogasa Takehiro
Goudreau Gage Dubuc
Kyowa Hakko Kogyo Co. Ltd.
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