Abstract
Dendrimer-supported proline 3 was synthesized and found to be a highly effective catalyst for the asymmetric aldol reaction in water. Thus, condensation of the prolyl N-sulfonamide 1 with 2a-c followed by deprotection of the Boc group with TFA gave the chiral dendritic catalysts 3a-c in 42-68% yield. All three catalysts 3a-c showed high activity and selectivity in the asymmetric aldol reaction of 4-nitrobenzaldehyde with cyclohexanone (86-99% yield, 98-99% ee) in water. The 2G-dendritic 3b exhibited the highest catalytic activity and selectivity in comparison with the other catalysts.
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