Direct palladium-catalyzed allylic alkylations of alcohols with enamines: Synthesis of homoallyl ketones
作者:Ghalia Bouhalleb、Olfa Mhasni、Giovanni Poli、Farhat Rezgui
DOI:10.1016/j.tetlet.2017.05.024
日期:2017.6
An efficient, direct nucleophilic allylic substitution of α-, β- and γ-substituted alcohols with enamines, using the Pd(OAc)2/PPh3 catalyst system and ZnBr2 as a promoter in CH2Cl2 at reflux, is reported. The reaction course was dependent on the steric hindrance at the α- or γ-positions with respect to the functionalized α-carbon, selectively affording in moderate to good yields, α- or γ-homoallyl
据报道,使用Pd(OAc)2 / PPh 3催化剂体系和ZnBr 2作为促进剂在CH 2 Cl 2中回流时,用烯胺有效,直接地亲和了α-,β-和γ-取代的醇的亲核烯丙基取代。反应过程取决于相对于官能化的α-碳在α-或γ-位的位阻,选择性地以中等至良好的收率提供α-或γ-全烯丙基酮,即所谓的“线性”和分别是“分支”产品。