Rhodium-Catalyzed Acylation of Vinylsilanes with Acid Anhydrides
作者:Motoki Yamane、Kazuyoshi Uera、Koichi Narasaka
DOI:10.1246/bcsj.78.477
日期:2005.3
A catalytic acylation of vinylsilane with acid anhydride is accomplished by the use of [RhCl(CO)2]2, in which the transmetalation between vinylsilane and rhodium(I) carbonyl complex plays a key rol...
The desilylation reaction of γ-silylated allylic sulfones was found to proceed through γ-silylated (E)-vinylic sulfones to afford the corresponding allylic sulfones by treatment with DBU and H2O. The Z/E ratio of the resulting allylic sulfones varied according to the γ-substituents of the γ-silylated sulfones. This stereochemical outcome was rationalized by “syn-effect.”
New methods and reagents in organic synthesis. 62 trimethylsilyldiazomethane: A convenient reagent for the preparation of acylsilanes
作者:Toyohiko Aoyama、Takayuki Shioiri
DOI:10.1016/s0040-4039(00)84433-0
日期:1986.1
The lithium salt of trimethylsilyldiazomethane smoothly reacts with alkyl halides to give α-trimethylsilyldiazoalkanes which are easily oxidized with m-chloroperbenzoic acid (m-CPBA), giving the corresponding acylsilanes (α-ketosilanes) in good yields.
Nitriles are obtained from reaction of acyltrimethylsilane phenylhydrazones with phosphorustrichloride, whereas under the same experimental conditions triphenylsilyl derivatives decompose and t-butyldimethylsilyl derivatives do not react. Evidences of the reaction pathway are reported.
We have developed an organocatalyticasymmetricMichaelreaction of acylsilane through the selection of acylsilane substrates and organocatalysts, thus creating a rare example of acylsilane α-alkylation with a chiral guanidine catalyst, which afforded products in good yields and high stereoselectivity. The corresponding adducts described here have also been demonstrated to be useful in the synthesis