Asymmetric aldol reaction catalyzed by new recyclable polystyrene-supported L-proline in the presence of water

作者：Liu Yu Xia; Sun Ya Nan; Tan Hao Han; Tao Jing Chao^*

来源：Catalysis Letters, 2008, 120(3-4): 281-287.

DOI：10.1007/s10562-007-9281-8

• aldol reaction
• asymmetric catalysis
• recyclable catalyst
• linear polystyrene
• L-proline

Two L-proline-based linear polystyrene anchored catalysts (1a-b) have been efficiently synthesized. By using only 5 mol% of catalysts, the corresponding products of the aldol reaction were obtained in good yields (up to 91%) with excellent anti diastereoselectivity (up to 93:7) and enantioselectivity (up to 98% ee) in DMF in the presence of water. The yields of these reactions in the ketone/water mixture were lower than those in wet DMF (up to 84%). However, the stereoselectivity was comparable (up to 92:8 anti/syn ratio and 96% ee, respectively). In addition, catalysts 1a-b could be recovered by a simple precipitation and filtration process. They can also be re-used for at least five times without obvious loss of catalytic efficiency.

• 出版日期2008-1
• 单位郑州大学