The present invention provides Methyl 5-acetamido-4-cyanamido-6-(1,2,3-triacetoxypropyl)-5,6-dihydro-4H-pyran-2-carboxylate of formula (VIII) or Methyl 5-acetamido-4-cyanamido-6-(1,2,3-trihydroxypropyl)-5,6-dihydro-4H-pyran-2-carboxylate of formula (IX). Compounds of formula (VIII) and (IX) may be used in the synthesis of zanamivir. The present invention also provides processes for preparing compounds (VIII) and (IX) and processes involving their use, including in the synthesis of zanamivir.
本发明提供了式(VIII)的甲基5-乙酰
氨基-4-
氰氨基-6-(1,2,3-三乙酰氧基丙基)-
5,6-二氢-4H-吡喃-2-羧酸甲酯或式(IX)的甲基5-乙酰
氨基-4-
氰氨基-6-(
1,2,3-三羟基丙基)-
5,6-二氢-4H-吡喃-2-羧酸甲酯。式(VIII)和(IX)的化合物可用于
扎那米韦的合成。本发明还提供了制备化合物(VIII)和(IX)的方法以及包括它们的使用的方法,其中包括在
扎那米韦的合成中使用。