Synthesis of Densely Substituted α,β,γ,δ-Dienones via the Pd<sup>II</sup>-Catalyzed Allylation, H-Migration, and Aerobic Oxidative δ-Hydride Elimination Cascade
作者:Feng-Quan Yuan、Fu-She Han
DOI:10.1021/ol203444g
日期:2012.3.2
A novel protocol for the highly stereoselective synthesis of E,E-α,β,γ,δ-unsaturated dicarbonyl compounds is presented. Starting from the readily available allylic alcohols and 1,3-diketones, an array of E,E-α,β,γ,δ-dienones can be efficiently synthesized in high yields via Pd-catalyzed dehydrative allylation, H-migration, and aerobic oxidative δ-hydride elimination cascade. In addition to the novel
提出了一种新的协议,用于E,E- α,β,γ,δ-不饱和二羰基化合物的高度立体选择性合成。从容易获得的烯丙醇和1,3-二酮开始,可以通过Pd催化的脱水烯丙基化,H迁移和好氧反应,以高收率高效地合成一系列E,E- α,β,γ,δ-二烯酮氧化δ-氢化物消除级联反应。除了新颖的反应机理外,还使用1:1的烯丙醇和1,3-二酮作为反应物,使用5 mol%的PdCl 2作为催化剂,使用1 atm的环境友好的O 2作为氧化剂,以及生成仅H 2 O副产物的残留量,使该方案快速,简单,原子效率高且清洁。