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Synthesis of spirolactone-type 6,7-seco-ent-kauranoid derivatives (80–91). Reagents and conditions: (a) MsCl, TEA, 0 °C; (b) LiBr, Li2CO3, DMF, 110 °C; (c) 10% HCl, THF (v/v, 1:1), rt; (d) Pb(OAc)4, K2CO3, THF, 0 °C; and (e) EDCI, DMAP, DCM, rt.
