Palladium-catalyzed [3 + 2] cycloaddition of 4-vinyl-4-butyrolactones with sulfamate-derived cyclic imines: construction of sulfamate-fused pyrrolidines.

The palladium-catalyzed [3 + 2] decarboxylative cycloaddition of 4-vinyl-4-butyrolactones with sulfamate-derived cyclic imines has been developed, providing the sulfamate-fused pyrrolidine derivatives in high yields with good diastereoselectivities. The scale-up reaction and further derivation of the product worked well, demonstrating the potential application of the current reaction in organic synthesis. A plausible reaction mechanism was also proposed.