Abstract
The natural (+)-lasonolide A (1), an anti-tumor agent, has been synthesized via thermodynamic benzylidene formation at the C 2 2 quaternary chiral center, use of a disulfone equivalent for elongation of the C 1 5 -C 1 7 three-carbon chain as well as introduction of the two trans olefins at C 1 5 and C 1 7 , iodocyclization for the upper THP. Michael addition for the bottom THP, and intramolecular Horner-Emmons olefination for the 20-membered macrolactone.
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