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Exploitation of the bromomethylene lactone functionality for transition metal-mediated tailoring chemistry upon the bicyclic xanthanolide core: (a) HCC-TMS, Cui, Cl2Pd (PPh3)2, Et2NH; (b) Bu3SnCC-TMS, cat. Pd2dba3, Pfur3, Δ (c) BrZnC(Ph)C=CH2, Pd(PPh3)4 Δ. (d) Bu3SnCH=CH2, Pd2dba3, Pfur3, Δ.
