反应详情

A 0.70 g (3.36 mmol) of methyl (2S,3S)-2-benzyl-3-hydroxybutyrate (optical purity: 96%e.e.; anti/syn=98/2) was dissolved in 1 ml of 2-propanol, and 0.34 g (6.72 mmol) of hydrazine monohydrate was added thereto dropwise at room temperature. After the addition, the mixture was refluxed for 8 hours, and then stirred overnight to obtain a concentrate. The obtained concentrate was crystallized by using a mixed solvent of ethyl acetate and hexane to give 0.45 g (64%) of the title compound. Melting point: 167.1° C. Optical purity: >99.9%e.e. anti/syn>99/1

1. customdropwise at room temperature
2. additionAfter the addition
3. temperaturethe mixture was refluxed for 8 hours
4. customto obtain a concentrate
5. concentrationThe obtained concentrate
6. customwas crystallized