SCHEME 1.
Synthesis of compounds 15–25 from 5 to 7 (a. BBr3/CH2Cl2, −20°C to rt; b. BBr3/CH2Cl2, −20°C to rt, then O2/silica gel/MeOH; c. Ac2O, DMAP, CH2Cl2, 40°C; d. O2/silica gel/MeOH, rt).
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