Access to Indenofluorene Skeletons via Pd-Catalyzed Sequential Reaction Involving Cyclization of Indenone-Allenyne intermediates

The rapid construction of 7,12-dihydroindeno[1,2- a ]fluorene skeletons is achieved via a tandem palladium-catalyzed cross-coupling, Alder–ene isomerization and cyclization sequence from 1-(2-iodophenyl)-3-arylprop-2-yn-1-ones and diynylic ethers.