Reactivity of α,β-unsaturated acetals with electrophiles in the presence of organolithium–potassium reagents
作者:Paolo Venturello
DOI:10.1039/c39920001032
日期:——
2-Propenyl- and 2-(2-methylpropenyl)-1,3-dioxane react with 2 equiv. of sec-butyllithium complexed with potassium tert-butoxide in tetrahydrofuran (THF) at â95 °C undergoing a 1,4 eliminative ring fission with subsequent proton abstraction at the α vinyl site of the enol ethers produced; carbanions obtained undergo substitution and addition reactions with electrophiles.
2-丙烯基-和 2-(2-甲基丙烯基)-1,3-二恶烷在四氢呋喃(THF)中与 2 等量的仲丁醇锂和叔丁醇钾络合物在 95°C 发生反应,发生 1,4 消环裂变,随后在生成的烯醇醚的 δ 乙烯基位点上发生质子抽取;得到的碳化物与亲电体发生取代和加成反应。