Spirocyclopropanated Benzoazocinones and Tetrahydropyridones from Bicyclopropylidene by 1,3-Dipolar Cycloaddition/Rearrangement - Cordero, Franca M; Barile, Ingrid; Brandi, Alberto; Kozhushkov, Sergei I; de Meijere, Armin (Synlett, 2000)