Scheme 5.
Synthesis of methyl 4,6-O-benzylidene-2,3-dideoxy-2-methanesulfonamido-3-thio-α-d-glucopyranoside 27. Reaction conditions: (i) MsCl, pyridine, 0 °C, 24 h 75%; (ii) KSAc, DMPU, 100 °C, 6 h, 60%; and (iii) LiAlH4, 0 °C to r.t., 4 h, 65%.
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