Scheme 2a.
aReagents: (a) m-CPBA, MeOH, 91%; (b) H5IO6, HC(OMe)3, MeOH, 74%; (c) Et3SiH, BF3·OEt2, 90%; (d) OsO4, NMO, 83%; (e) BBr3, 70%.
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