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-乙酰氨基-4-氨基-6-(1,2,3-三乙酰氧丙基)-5,6-二氢-4H-吡喃-2-羧酸酯(V)的方法,该方法包括在还原剂的存在下,从以下组中选择还原剂:氢化铝锂,硼氢化钠,氯铵锌,氯化铁锌和氯化铁/碘化钠,还原甲基5-乙酰氨基-4-叠氮基-6-(1,2,3-三乙酰氧丙基)-5,6-二氢-4H-吡喃-2-羧酸酯(IV)。本发明还提供了式(VIII)和式(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)的方法以及涉及它们的使用的方法,包括在扎那米韦的合成中。