| 摘要 |
<p>An optically active 2,6-dimethyltyrosine derivative represented by formula (1) (wherein R1 represents a hydrogen atom or a protecting group for a phenol group; R2 represents a protecting group for an amino group; and * represents an asymmetric carbon atom) and having improved optical purity can be produced by precipitating and removing a solid material having low optical purity from a solution comprising the optically active 2,6-dimethyltyrosine derivative and an organic solvent to improve the optical purity of the derivative in the mother liquor.</p> |
