Enantioselective synthesis of 4-aminopyrrolidine-2,4-dicarboxylate derivatives via Ag-catalyzed cycloaddition of azomethine ylides with alkylidene azlactones

A catalytic highly enantioselective silver–DTBM-segphos catalyzed cycloaddition of α-iminoesters with alkylidene azlactones is reported. This procedure provides an effective access to 4-aminopyrrolidine-2,4-dicarboxylate derivatives with high diastereo- and enantioselectivity.