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Conditions: a. Ac2O/CH2Cl2/py, DMAP, r.t, 2 h, 98%; b. NaBH4, MeOH, 10°C, 1.8 h, 3, 28%, 4, 43% and 3+4, 29%; c. OsO4/NaIO4, THF/H2O (1:1), r.t, 72 h, 5, 68%, 6, 7.2%; d. RuCl3·3H2O, MeCN/H2O, NaIO4, 40°C, 5 h, 5, 76%, 6, 6.3%; e. KMnO4/MgSO4, Me2CO, r.t, 72 h, 7, 63%, 5, 8.6% and 6, 1.2%.
