Preparation of Silyl Enol Ethers Using (Bistrimethylsilyl)acetamide in Ionic Liquids
作者:Michael Smietana、Charles Mioskowski
DOI:10.1021/ol015602h
日期:2001.4.1
[reaction: see text]. Ionic liquids have been used for the preparation of silylenolethers from aldehydes and ketones with (bistrimethylsilyl)acetamide (BSA) in good yields.
Highly selective, kinetically controlled enolate formation using lithium dialkylamides in the presence of trimethylchlorosilane
作者:E.J. Corey、Andrew W. Gross
DOI:10.1016/s0040-4039(00)99920-9
日期:1984.1
The deprotonation of ketones and esters with lithium dialkylamides in the presence of trimethylchlorosilane leads to enhanced selectivity for the kinetically generated enolate. Lithium -octyl--butylamide is shown to be superior to lithiumdiisopropylamide in the regio-selective generation of enolates and in the stereoselective formation of enolates.
Copper-catalyzed conjugate addition of the Grignard reagents in the presence of Me3SiCl and HMPA proceeds in much higher yield than the reaction of conventional organocopper reagents and shows very good regio-, stereo-, and chemoselectivities.
Trialkylsilyl chlorides, particularly in combination with hexamethylphosphoramide or 4-dimethylaminopyridine, dramatically accelerates the conjugate addition of catalytic and stoichiometric organocopperreagents onto enones, enals, and enoates, in which very high degrees of stereo- and chemoselectivities were observed.
Photochemical Reaction of 2,3-Dichloro-1,4-naphthoquinone with Enol Silyl Ethers
作者:Kazuhiro Maruyama、Seiji Tai、Hiroshi Imahori
DOI:10.1246/bcsj.59.1777
日期:1986.6
2-Oxoalkylated 1,4-naphthoquinones were obtained in the photochemicalreactions of 2,3-dichloro-1,4-naphthoquinone with 2-trimethylsiloxy-1-alkenes. Application of this method afforded a wide variety of functionalized 2-oxoalkylated 1,4-naphthoquinones. The photochemicalreactions of 2,3-dichloro-1,4-naphthoquinone with 1-alkyl-2-(trimethylsiloxy)ethylenes gave naphthol derivatives. However, 1,1-d