Glyoxylic acid versus ethyl glyoxylate for the aqueous enantioselective synthesis of α-Hydroxy-γ-keto acids and esters by the N -Tosyl-(S a)-binam- l -prolinamide-organocatalyzed aldol reaction

1. Moles, F.J.N.
2. Guillena, G.
3. Nájera, C.
4. Gómez-Bengoa, E.