Scheme 2.
Preparation of compounds 2–8 from OA 1: i. (1) Jones reagent, Me2CO, 0 °C, (2) NH3OHCl, Py, rt; ii. (1) Jones reagent, Me2CO, 0 °C, (2) AllylMgCl, dry THF, 0 °C; iii. OsO4 (cat.), NMO, rt, Me2CO/H2O6:1.
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