FIELD: chemical or physical processes.
SUBSTANCE: invention relates to a method of producing a compound of formula (Id) or a pharmaceutically acceptable salt thereof from compound (I), where said method involves reaction of compound (A2) with (2S,3S,4S,5R,6R)-2-(methoxycarbonyl)-6-(2,2,2-trichloro-1-iminoethoxy)tetrahydro-2H-pyran-3,4,5-triyltriacetate in aprotic solvent in the presence of a Lewis acid to obtain compound (A3) and a step for removing the protective group from compound (A3) using a nucleophilic reagent. Invention also relates to a compound of formula (A3) or a salt thereof and use of the compound of formula (A3) in a method of producing the compound of formula (Id).
EFFECT: obtaining a compound of formula (Id) with high output.
14 cl, 9 dwg, 3 tbl, 12 ex
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