THE NEW MICHAEL REACTION

Abstract It was found that silyl enol ethers react with α,β-unsaturated ketones and esters in the presence of TiCl4 under mild (−78°C) conditions to give 1,5-dicarbonyl compounds in good yields. Further, it was also found that 1-phenyl-1,5-hexanedione and its monoacetal were obtained by the TiCl4-promoted reaction of methyl vinyl ketone ethylene acetal with α-trimethylsiloxystyrene.