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Synthesis of methyl 2-amino-4,6-O-benzylidene-2-deoxy-α-d-allopyranoside 20. Reaction conditions: (i) Tf2O, pyridine, DCM, −20 °C, 2 h, 93%; (ii) NaNO2, DMF, r.t., 6 days, 67%; and (iii) 4N KOH, EtOH:2-methoxyethanol (2:1), 80 °C, 20 h, 52%.
