A polymer-supported bifunctional thiourea organocatalyst (PS-TU) has been prepared and successfully used in the enantioselective a-amination of 1,3-dicarbonyl compounds with azodicarboxylates. In contrast with homogeneous thioureas, PS-TU is not irreversibly deactivated by the azodicarboxylate reagents, and simple washing with triethylamine between runs has allowed the repeated reuse (9 cycles) of the PS-TU catalyst. The a-amination mediated by PS-TU has also been adapted to perform the enantioselective amination (93% ee) of ethyl 2-oxocyclopentanecarboxylate in continuous flow (7.5 h operation, 21 min residence time, TON = 37).