Stereoselective synthesis of key fragments for the synthesis of aplysiatoxin has been achieved. All the stereogenic carbons contained in fragments B≈E were elaborated on the basis of [2,3] Wittig rearrangement and titanium-mediated asymmetric epoxidation.
A totalsynthesis of aplysiatoxin was achieved formally by construction of Kishi's intermediate 13 which carried all the stereochemistry required for the synthesis of aplysiatoxin, from four fragments described in the preceding communication.