Scheme 1. Reagents and conditions.
a) Selectfluor®, dioxane, nitromethane, 80°C, 24h; b) Jones reagent, acetone, ice; c) i - glacial acetic acid, sulfuric acid, NaN3, 65°C; ii - 30°C, 5h; d) m-CPBA 77%, CHCl3, r.t., 120h.
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