Synthesis of Sterically Hindered Bicyclo[2.2.2]octanes by Lewis Acid Catalyzed Reaction of 2-(Trimethylsiloxy)-1,3-cyclohexadienes with 4-Methyl-3-penten-2-one
Dienol silyl ethers of various 2-cyclohexenones reacted with 4-methyl-3-penten-2-one(mesityl oxide) or methyl acrylate in the presence of Lewis acid to give bicyclo[2.2.2]octanes in moderate yields.