The three‐component free‐radical carbo‐alkenylation of electron‐richolefins has been studied, varying the substitution pattern in the alkene, in the radical precursor and in the final acceptor. New vinylsulfones were also prepared and their reactivity investigated. The scope and limitations of the process was established, and the reaction mechanism clarified using selected dienes as radical clocks
Chemistry of cyclopropylacylsilanes I. α-functionalized acylsilane reagents for the cyclopropanation of electrophilic alkenes
作者:James S. Nowick、Rick L. Danheiser
DOI:10.1016/s0040-4020(01)86660-6
日期:1988.1
effect the cyclopropanation of electrophilic alkenes. The lithium enolate derivatives of the α-haloacylsilanes 14,15, and 17 react with a wide variety of electron-deficient olefins to afford cyclopropylacylsilanes in good yield. In the case of cyclopropanations of α,β-unsaturated carbonyl compounds using the α-chloro reagent 14, the predominant stereoisomers produced are generally the cyclopropanes in which