Regio- and Stereoselective Synthesis of 2,3,5-Trienoates by Palladium-Catalyzed Alkoxycarbonylation of Conjugated Enyne Carbonates
作者:Ezgi Şule Karagöz、Melih Kuş、Gürkan Eray Akpınar、Levent Artok
DOI:10.1021/jo5014993
日期:2014.10.3
Palladium-catalyzed carbonylation of 2,4-enyne carbonates in an alcohol and under balloon pressure of CO proceeds through 1,5-substitution to yield (E)-2,3,5-trienoates. The olefin geometry of the substrate is important to control the overall stereochemistry of this alkoxycarbonylation method. The reaction proceeds through successive formation of π-allylpalladium with an R3 group oriented syn and σ-allenyl
钯在醇中和在CO的气球压力下催化2,4-烯炔碳酸酯的羰基化反应通过1,5-取代而生成(E)-2,3,5-三烯酸酯。底物的烯烃几何形状对于控制这种烷氧羰基化方法的整体立体化学很重要。该反应通过依次形成具有R 3基团的顺式和σ-烯基钯配合物的π-烯丙基钯来进行。