Inoue A, Kondo J, Shinokubo H, Oshima K. Reactions of gem-dibromo compounds with trialkylmagnesate reagents to yield alkylated organomagnesium compounds.
Chemistry 2002;
8:1730-40. [PMID:
11933101 DOI:
10.1002/1521-3765(20020402)8:7<1730::aid-chem1730>3.0.co;2-6]
[Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
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 small middle dot2 LiCl 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 Me(3)MgLi yields 1-bromo-1,1-disilylethanes 25 that can be converted into 1,1-disilylethenes 29 by dehydrobromination.
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