The Double Michael Reaction of α,β-Unsaturated Ketones with Siloxydienes Catalyzed by Trityl Perchlorate Forming Six-Membered Ring Systems

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Abstract
In the presence of a catalytic amount of trityl perchlorate, the double Michael reaction of α,β-unsaturated ketones with siloxydienes smoothly proceeds to afford six-membered ring systems stereoselectively in good yields. Decalin derivatives are also obtained according to this procedure.