Transition Metal Intervention for a Classic Reaction: Assessing the Feasibility of Nickel(0)-Promoted [1,3] Sigmatropic Shifts of Bicyclo[3.2.0]hept-2-enes
journal contributionposted on 23.08.2010, 00:00 by Osvaldo Gutierrez, Dean J. Tantillo
Density functional theory calculations (B3LYP/LANL2DZ) were used to evaluate the feasibility of Ni(0)-N-heterocyclic carbene-promoted [1,3] sigmatropic rearrangements of bicyclo[3.2.0]hept-2-enes to bicyclo[2.2.1]hept-2-enes. We predict that transition metal intervention lowers the barrier and changes the stereoselectivity for such reactions. Moreover, the addition of electron-withdrawing groups to the migrating carbon was found to lower the barrier for oxidative addition, while incorporation of sterically hindered groups was found to increase the driving force for the reaction.