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Syntheses of fascaplysin derivatives 16–18. Reagents and conditions: (a) R-CH(COOEt)2 or PhCH2-COOEt (8 equiv.), NaH (4 equiv.), DMF, ∆, 0.5 h; (b) BH3·THF (24 equiv.), THF, Ar, ∆, 2 h, then H2O/H+, air, ∆, 2 h; (c) BH3·THF (24 equiv.), THF (autoclave), MW, 50 W, 30 min, then H2O/H+, air, ∆, 2 h.
