The cinchona alkaloid-catalyzed gamma-amination of alpha,beta-unsaturated acyl chlorides with azodicarboxylates to give the corresponding dihydropyridazinones in good yields with high enantioselectivities has been developed. Reductive ring opening of the dihydropyridazinones afforded series of cyclic and acyclic gamma-amino acid derivatives in good yields with high enantiopurity.