Abstract
2-(Trimethylsilylmethyl) cyclopropyl ketones were smoothly cleaved with boron trifluorideacetic acid complex under mild reaction conditions with the assistance of the trimethylsilyl group to give γ, δ-enones in good yields. The major effect of the trimethylsilyl group in the ring opening of the cyclopropyl ketones was unambiguously confirmed in the dicyclopropyl ketone 15 : one of its two cyclopropyl rings, which has a trimethylsilylmethyl group, was selectively cleaved. Furthermore, the reaction was applied to the formal total synthesis of cis-jasmone.
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