title: Highly stereoselective oxazaborolidinium ion catalyzed synthesis of (Z)-silyl enol ethers from alkyl aryl ketones and trimethylsilyldiazomethane.
abstract: Highly stereoselective (Z)-silyl enol ethers were prepared from alkyl aryl ketones and trimethylsilyldiazomethane (TMSD) using an oxazaborolidinium ion catalyst. In addition, ring-expanded silyl enol ethers were successfully constructed from cyclic ketones. Their synthetic utilities were shown by sequential Mukaiyama aldol and [2 + 2]-cycloaddition reactions.
authors.affiliation: Department of Chemistry, Sungkyunkwan University , Suwon, 440-746, Korea.
authors.forename: Byung Chul
authors.initials: BC
authors.lastname: Kang
authors.forename: Su Yong
authors.initials: SY
authors.lastname: Shim
authors.forename: Do Hyun
authors.initials: DH
authors.lastname: Ryu