A series of prolyl and 4-substituted prolyl sulfonamides were prepared and were evaluated as organocatalysts of asymmetric aldolreaction. Using prolyl methanesulfonamide, 4-benzyloxy-pro- lyl methanesulfonamide and toluenesulfonamide and 4-hydroxy- prolyl toluenesulfonamide the aldol product was obtained in much higher enantiomeric excess (ee) in comparison to that observed us- ing proline itself