申请人:Phull Manjinder Singh
公开号:US20110257418A1
公开(公告)日:2011-10-20
The present invention provides a process for preparing methyl 5-acetamido-4-amino-6-(1,2,3-triacetoxypropyl)-5,6-dihydro-4H-pyran-2-carboxylate (V), which process comprises reducing methyl 5-acetamido-4-azido-6-(1,2,3-triacetoxypropyl)-5,6-dihydro-4H-pyran-2-carboxylate (IV) in the presence of a reducing agent selected from the group consisting of lithium aluminium hydride, sodium borohydride, zinc/ammonium chloride, zinc-ferric chloride and ferric chloride/sodium iodide. The present invention also provides compounds of formula (VIII) and (IX) which 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.
本发明提供了一种制备甲基5-乙酰胺基-4-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(V)的方法,其中该方法包括在还原剂的存在下,选择从锂铝氢化物、硼氢化钠、氯化铵锌、氯化铁锌和氯化铁/碘化钠组成的还原剂中的一种还原甲基5-乙酰胺基-4-叠氮-6-(1,2,3-三乙酰氧基丙基)-5,6-二氢-4H-吡喃-2-羧酸甲酯(IV)。本发明还提供了式(VIII)和(IX)的化合物,这些化合物可用于合成扎那米韦。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,包括在扎那米韦的合成中使用。