N-Protected hydroxyprolines (Hyp) were transformed chemoselectively into alkoxyproline derivatives by direct O-alkylation. The starting Hyp was transformed into the corresponding dianion in a mixture of dimethyl sulfoxide and tetrahydrofuran (1:16 v/v) as solvent. Under these conditions, the carboxy-anion showed reduced nucleophilicity because it was specifically solvated, and the more reactive oxy-anion
recyclable fluorous proline catalyst with high stereoselectivity that functions as a catalyst for asymmetricaldolreactions is described. Its high stereoselectivity and facile recovery are achieved by employing a multi-fluorous tag attachment strategy. Although a gradual decrease was observed with respect to the catalytic activity, the catalyst can be separated from the reaction mixture by adsorption onto