Reactions of 2-chloroacyltrimethylsilanes with Grignard reagents have been examined. Thus, treatment with methylmagnesiumiodide affords the corresponding 3-(trimethylsilyl)-2-alkanones through an initial addition followed by removal of chloride anion and 1,2-rearrangement of silyl group. In contrast, the reaction proceeds with 2 equiv of the Grignard reagents bearing β-hydrogen to give 2-(trimethylsilyl)-1-alkanols
The reaction of an acyltrimethylsilane enolate with 2 eq of an aldehyde gives a 1:2 adduct, while that with the enolate of an α-chloroacyltrimethylsilane affords an α, β-unsaturated aldehyde as a 1:1 adduct accompanied by the carboxylic acid derived from the starting aldehyde. An oxidation-reductionreaction mechanism on the trimethylsilylcarbonyl group has been proposed.
AN EFFICIENT METHOD FOR THE PREPARATION OF ACYLSILANE AND α-HALOACYLSILANE
作者:Isao Kuwajima、Toru Abe、Naoki Minami
DOI:10.1246/cl.1976.993
日期:1976.9.5
On treating 1,1-bis(trimethylsilyl)alkan-1-ol with t-butylhypochlorite, the corresponding acylsilane is obtained in good yield, while the reaction of the alcohol with NBS, in contrary, affords α-bromoacylsilane exclusively.