Green Chemistry p. 2217 - 2225 (2015)
Update date:2022-09-26
Topics: Enantioselective solvent-free conditions Polystyrene Thioureas aza-Henry reactions
Pedrosa, Rafael
Andrés, José M.
ávila, Deisy P.
Ceballos, Miriam
Pindado, Rodrigo
Novel bifunctional ureas and thioureas immobilized on sulfonylpolystyrene have been prepared as recoverable and reusable organocatalysts and have been used in the stereoselective aza-Henry reaction under solvent-free conditions. The activity and stereoselection of the catalysts are dependent on the length of the tether bridging the active site and the polymer, the catalyst derived from 1,6-hexane diamine being the best one. It has also been demonstrated that the supported catalysts are more effective than the homologous soluble catalysts.
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