The first total synthesis of (+)-vibsanin A, an
11-membered vibsane diterpenoid, was achieved, unambiguously
establishing its relative and absolute stereochemistry.
Highlights of the synthesis include the stereoselective
formation of an all-carbon quaternary stereocenter by a zincmediated
Barbier-type allylation in an aqueous medium, and
the efficient construction of an 11-membered ring skeleton by a combination of an intramolecular Nozaki−Hiyama−Kishi
(NHK) reaction and a Mitsunobu reaction