Abstract
The total synthesis of Hemibrevetoxin B is described. A new cyclization approach, based on the Lewis acid mediated intramolecular cyclization of the γ-oxo-substituted allylic tin having an aldehyde group, produced the 6-6-7-7 polycyclic ether skeleton of the natural product with high stereoselectivity. The 1H and 13C-NMR spectra of synthetic hemibrevetoxin B was identical with those of natural product.
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