Reactions ofgem-Dibromo Compounds with Trialkylmagnesate Reagents to Yield Alkylated Organomagnesium Compounds
摘要:
The reaction of gem-dibromocyclopropanes 5 with nBu(3)MgLi affords butylated cyclopropylmagnesium species that can be trapped with various electrophiles. The reaction of dibromomethylsilanes 12 requires the addition of a catalytic amount of CuCN.2LiCl for smooth migration of the alkyl groups. The resultant alpha-silylpentylmagnesium compounds 16 react with electrophiles, such as acyl chlorides or alpha.beta-unsaturated ketones to afford alpha- or gamma-silyl ketones, respectively. Treatment of dibromodisilylmethanes with Me3MgLi yields 1-bromo-1,1-disilylethanes 25 that can be converted into 1,1-disilylethenes 29 by dehydrobromination.
作者:Dietmar Seyferth、Robert L. Lambert、Earle Marie Hanson
DOI:10.1016/s0022-328x(00)84494-0
日期:1970.10
chloride and trimethyltindibromomethylmagnesium chloride reagents. Reactions of these lithium reagents with trimethylchlorosilane, trimethyltin chloride, mercuric halide, dimethyl sulfate and water are described. The action isopropylmagnesium chloride in THF on trimethyl(dibromomethyl)silane, trimethyl(diiodomethyl)silane and bis(trimethylsilyl)dibromomethane led principally to reduction to the respective