Simple ligand-free copper systems
were found as efficient catalysts
for the addition of 1,3-dicarbonyl compounds to <i>N</i>-allenyl derivatives. This highly regio- and stereoselective reaction
has been accomplished in the presence of malonates, 1,3-ketoesters,
and 1,3-diketones with good to excellent yields under mild conditions.
This methodology represents the first allylation of 1,3-dicarbonyl
compounds with allenes catalyzed by copper
