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Synthesis of methyl 2,3-dideoxy-4,6-O-benzylidene-3-thio-2-trifloromethanesulfonamido-α-d-glucopyranoside 31. Reaction conditions: (i) Tf2O, pyridine, DCM, −20 °C to 0 °C, 2 h, 51% (29), 34% (28); (ii) Tf2O, pyridine, DCM −20 °C, 2 h, 61%; (iii) KSAc, MeCN, 5 to 20 °C, 40%; and (iv) NaOMe, MeOH, r.t., 18 h, 76%.
