Silver-catalyzed ring-opening [3+2] annulation of cyclopropenones with amides

A ring-opening [3+2] annulation reaction between cyclopropenones and amides was developed to produce 5-amino-2-furanones. Insertion of the carbonyl group of an amide to the C-C single bond of a cyclopropenone occurred efficiently in the presence of a catalytic amount of silver(i) triflate.