[4 + 2] Annulation of Donor-Acceptor Cyclopropanes with Acetylenes Using 1,2-Zwitterionic Reactivity.
Roman A NovikovAnna V TarasovaDmitry A DenisovDenis D BorisovVictor A KorolevVladimir P TimofeevYury V TomilovPublished in: The Journal of organic chemistry (2017)
A new process for the [4 + 2] annulation of donor-acceptor cyclopropanes with acetylenes under the effect of anhydrous GaCl3 using 1,2-zwitterion reactivity was elaborated. The reaction opens access to substituted dihydronaphthalenes, naphthalenes, and other fused carbocycles. The direction of the reaction can be efficiently controlled by temperature.