Abstract
[see reaction]. A synthesis of tetracycle 2 corresponding to the C(11)-C(26) fragment of pectenotoxin II is described. The synthesis features two highly stereoselective [3 + 2]-annulation reactions of chiral allylsilanes, generated via allylboration of aldehydes with the chiral gamma-silylallylborane 4 or the gamma-silylallylboronate 19, for construction of the highly substituted C and E rings.
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