Electrophilic cyclization of polyene allylsilanes. Synthesis of albicanyl acetate

Abstract
The allylsilanes 5 [Formula: see text] were prepared by a nickel(II) catalyzed coupling of trimethylsilylmethylmagnesium chloride with the enol phosphate of the corresponding β-keto esters. Stannic chloride and mercuric trifluoroacetate effected a cyclization of 5. The product from 5b was converted into the marine natural product, albicanyl acetate (1)[Formula: see text]

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