Mechanistic studies on nickel-catalyzed enantioselective [3 + 2] annulation for γ-butenolide synthesis via C–C activation of diarylcyclopropenones

Detailed mechanistic studies on Ni-catalyzed C–C activation of cyclopropenones, and enantioselective [3 + 2] annulation with α-CF₃ enones or 1,2-diones toward the efficient synthesis of γ-butenolides.