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
Palladium-catalyzed coupling of 2-en-4-yne carbonates with terminal alkynes
作者:Doğan Taç、Levent Artok
DOI:10.1016/j.tetlet.2018.01.062
日期:2018.3
The first palladium-catalysed coupling of the carbonates of (E)-configured conjugated enynols with terminalalkynes is described. This method allows the synthesis of vinyl-allenynes with good yields. It has been determined that the method is not suitable for the (Z)-configured substrates.