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Synthetic route of spirolactone-type diterpenoid skeletons from oridonin. Reagents and conditions: (a) Jones reagent, acetone, 0 °C; (b) Pb(OAc)4, Na2CO3, THF, rt; (c) 2,2-Dimethoxypropane, acetone, TsOH, 56 °C; (d) Ac2O, TEA, DMAP, rt; and (e) 10% HCl, THF, rt.
