| abstract |
Methods of preparing neuramic acid derivatives, also synthetic intermediates of neuramic acid derivatives and methods for their preparation, and high purity neuramic acid derivatives are provided. [Solution] Synthetic intermediate compounds represented by formula (7) are provided: [Wherein R 3 represents alkyl, R 4 and R 5 each represent H, alkyl, phenyl, or together represent tetramethylene, pentamethylene, oxo]. |