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Mitsunobu reactions of natural products 1 and 2 that afford unstable derivatives: a) Triphenylphosphine (5 eq.), DIAD (5 eq.), corresponding alcohol (5 eq.), and dry THF, under argon atmosphere, derivatives 6 to 11. *Reactional conditions described in Material and Methods (section Reaction Procedures) and NMR characterization available on Supplementary Material .
