Scheme 3.
Enantioselective Synthesis of an L-Ribose Derivative. a) OsO4 (5 mol%), K3Fe(CN)6, K2CO3, tBuOH/water, 66% yield, 9:1 dr. b) O3 then Me2S. c) HCl in MeOH (anh.), 47% yield (over two steps).
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