Gold-catalyzed stereocontrolled oxacyclization/[4+2]-cycloaddition cascade of ketone-allene substrates.
We report the first success on the Au-catalyzed tandem oxacyclization/[4+2]-cycloaddition cascade using ketone-allene substrates to give highly substituted oxacyclics with excellent stereocontrol. In contrast to oxo-alkyne substrates, the resulting cycloadducts are isolable and efficiently produced from a reasonable scope of enol ethers.
Teng
Tse-Min
TM
Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan, ROC.
Liu
Rai-Shung
RS