We have developed an efficient method for the preparation of enol silyl ethers using novel agents, silazanes together with NaH or DBU catalyst, wherein TMS and TBDMS groups were smoothly and chemoselectively introduced into ketones and aldehydes under mild conditions.
Nucleophilic reactions of various enol silylethers with carbocation species generated from propargylsilylethers by the action of a Lewis acid have been developed. The present method is highly useful for the introduction of allenic or enyne functionalities into the alpha-position of substituted ketones. [reaction--see text]
Preparation of -butyldimethylsilyl (tbdms) enol ethers using potassium hydride in the presence of tbdms chloride
作者:John Orban、John V. Turner、Bruce Twitchin
DOI:10.1016/s0040-4039(01)91129-3
日期:1984.1
TBDMS enolethers can be readily prepared regio- and stereoselectively under equilibrating conditions in high yield by adding potassiumhydride to a THF solution of ketone with TBDMS chloride in situ.
作者:Jinhua J. Song、Zhulin Tan、Jonathan T. Reeves、Daniel R. Fandrick、Nathan K. Yee、Chris H. Senanayake
DOI:10.1021/ol703025b
日期:2008.3.1
In the presence of a catalytic amount of NHC 3 (IAd, 0.1 to 5 mol %), a series of enolizable ketones as well as cyclohexanecarboxaldehyde were efficiently converted into the corresponding silyl enolethers at 23 degrees C in THF.
The synthesis of α,ω-dicarboxylic acids and unsaturated monocarboxylic acids by metal-ion promoted ring-opening of cyclic α-t-butyl-dimethylsilyloxy hydroperoxides has been described.